Yeah, the way Im currently looking at it is to think of it as a different class of device to the iPad. Even before my Nexus 7 arrives Im thinking of a range of things that will still work better on an ipad or other large tablet. Its appeal for me as a developer is that lots of people will end up with a device that is quite powerful and the right price, and Im kind of looking forward to working out the best way to design stuff for this sized screen.
Mine is still on schedule to be delivered on tuesday, and Im still busy tinkering around with developer tools. Theres plenty I can do with Unity, but part of the appeal of Android for me is to delve into the platform specifics & write stuff in Java, then start to learn OpenGL ES 2.0 which if I do ok at it I'll then be able to apply to other platforms such as iOS and WebGL later. If I had gotten on OK with Objective C then I'd probably just have stuck with iOS dev right now, but it turns out I dont like Objective C or the stupidly long names that Apple use in their API's. And there is something a bit soul-destroying about developing stuff that only Apple owners can use. And my first few days of staring at Android Java stuff hasnt hurt too much so far.