"One thought I had is who will provide the voice of the supporters. Is this to committee or the supporters association?"
As someone who is honoured to serve on the Football Club committee, I think the committee would be the voice of the Club; but the supporters should be voiced both through the Supporters Trust, AND through individual supporters. Once planning permission to be formalised by an application, actually before this, just after the next public consultation from the developers, which they have promised in September/October; I think the Trust should hold open public meetings for fans to talk to developers, to nail them down on what exactly we can build, and what we can't be built. Then we need to tell them how these 'shells' need to be built within those contstraints. For example, the current ground had no input from football people at all. Which is which the terracing is so awful, as one example. In the quarter of a century since the current ground will have been done, and hopefully the new one ready, there have been so many advances...all-weather pitch; living wall like a la The Oval around the ground; full cycle provision; solar panels; enegery efficiency all round; modern floodlights to cut light polution...I am sure there are plenty of other things that don't come immediately to mind. I would like to see public meeting(s), consultation with fans, then a quick blueprint document of what the fans/Trust envisage for a future stadium. As well as community ownership, but that's further along I would think.
All of the above is why I am currently behind Hadleys...as well as similar to what Jamie said: without them we would NOT be having this discussion now.