I have to say my main concern just at the moment is about the guild stores they've been talking about. For a couple of reasons.
~ I understand you don't have to be a member of a guild to buy anything, but you do in order to sell (unless restricting yourself to spamming a chat channel). Guild numbers are capped at 500, I believe. The devs have stated that they want to encourage super influential guilds that are well known for having the best weapons, others that are well known for having the best armours, etc., as well as encouraging inter-guild contact. This brings up a problem, in that specific trade guilds will be looking to only recruit people who can prove themselves to be the best crafters in any particular profession, which automatically excludes 99% of the playerbase. Perhaps there will be a variety of lesser trade guilds open to others who aren't the best of the best, but depending on your ability to get into the ones that get their names known you're going to be sadly out of luck if you want to be able to just join a random trade guild and expect to sell anything. Worst case scenario is we get monopolies forming, with guilds allying with each other to ensure they tie up market share, where what they sell is tailored to veteran players and those they are personally helping level, and trade chat channels - if they end up having dedicated ones - get filled even more with spamspamspamspamspam, and your average player has that avenue of revenue locked away from the get go. Best case scenario is it works wonderfully to foster a flourishing economy where everyone is given a chance and a place to be able to roll up and sell those 10 superfluous hide vests they made as they were trying to level up their crafting a bit while they decide what they want to do next. I haven't experienced a system like this before, so I don't know what to expect.
~ My understanding is that they currently have it that you can only set up a guild store in a keep in Cyrodiil that your faction holds in PvP. I'm unsure at the moment if this means that guilds will be required therefore to have a physical presence in every single siege in order to be able to set up that store, or whether there will be an electronic interface that allows the guild leader or subordinates to see what keeps are held right now and click "set up store here" regardless of whether any of their guild mates are physically in that keep at the time. If it's the former, then again smaller trade guilds are screwed over because they are less likely to have successful PvP players than the more organised super guilds, and they simply might not have the numbers on the ground to ensure one of them can be in the right keep at the right time to set up a store. Not to mention that it becomes a requirement that at least some of the members of a trade guild must be prepared to PvP in the first place - so your PvE or casual RP oriented guilds that want to deal with trade are going to be in a tough spot.
~ Which leads me onto the buyers. Again, stores are going to be in Cyrodiil, and they will be spread about by the sounds of it, with some being in Keep A, some in Keep B, etc. It sounds like buyers are going to have to traipse all over Cyrodiil to shop around at different guild stores, trying to find what they want, of course sticking to the keeps that are currently under the control of their faction. If the DC are having a bad run of it and haven't been able to control a keep for the past 5 days then... well, no buying anything at all for you! Unless you join a guild that has decent traders, because you'll be able to use the guild trade interface. But, numbers are capped at 500, and the best traders will be in the best guilds... and we're back at that old problem again. And what if you're in guilds for reasons other than trade, to play with friends, to RP, to get pro help, etc., and the only crafters there deal with heavy armour and weapons and provisioning? Where do you get your potions and light armour or your bows? By shopping around in Cyrodiil, which might not be as easy as you'd like...
~ If you can't get what you need in your own guilds, then you're going to have to go into Cyrodiil whether you want to PvP or not. You'll have to make sure you're online at a time when your faction has at least one keep. You'll have to run the risk of being ganked 50 times on your way to get there, which could end up costing more in armour repairs than it would to buy that nice new helm you've been on the lookout for in the first place. For someone who doesn't like to PvP, who simply doesn't have the skill, or who is still honing their skills, being essentially forced into a PvP zone where you have to pray to your gods of choice in the hope that you don't get ganked by Stealthed Griefer #476 on your way ... well it doesn't sound like a whole lot of fun to me. Now, I want to PvP, this is the first game I've seen that has made me want to join in. That being said, I don't expect to be very good at it, and I don't expect to spend a lot of time doing it either. It'll be something I pick up and try to join in with when I fancy a break from the rest of the game, some mindless fun, running with the zerg, maybe trying to stealth around a bit, whatever. But I shouldn't feel pressured into worrying about running the gauntlet that I'm ill prepared for just because I need a new sword and to stock up on potions. I can try to craft myself, but I'm not going to be able to maintain it in all the skill lines I need, to the level that I need, with the ready supply of mats that I need when my level 20 bow just isn't cutting it in a level 35 area anymore.
To summarise: I understand that we don't have all the details yet, and a lot of my fears might be put aside in their entirety depending on how this is all implemented, but as it stands right now I understand absolutely and completely agree with the desire to encourage more community engagement and to encourage people experiencing PvP areas, but I am very wary of the implication that people will be forced to do things like PvP in order to get access to a very basic game mechanic. I would have many of my worries put to rest if they allowed guild stores to be opened in main cities, even if they were tied in some way to the % of Cyrodiil a faction or guild held at any one time (although that isn't ideal). I would have even more of my worries salved if I knew there would be an accessible way for regular people to be able to sell their wares without having to be part of the guilds who've got it all sewn up for themselves. Or by relying on spamming trade chat. Even if it's some kind of slot you sign up for, whereby you can be a part of a farmers' and crafters' market on the outskirts of the main city. My thoughts are muddy on it because I don't have all the facts, and I don't have a lot of experience with this sort of thing.
I know I sound very negative. I'm very excited to play the game. That doesn't mean I turn off my critical faculties though.