Strawsons were pushing plans for an eco town a few months back, presumably as they'll get major grant assistance if they do manage to promote it that way. I'd suspect the plan may not go down too well with the powers that be though, as from what I've heard of things, they own a number of other ex RAF sites, so would no doubt come begging for assistance to convert them in a similar way too.
Site plans are here
Site plans are here