These things take time.
Yes, it's a bit disappointing that we're still no nearer to seeing concrete and public plans for the Collar Site, Etihad Campus, and the wider area.(PDF vision are good and well)
However, I think we have to give MCC(and ADUG) some credit.
Rather than just building a Blackpool style theme park on the Collar site, etc, they are trying to create a real lasting sporting and education related legacy to tie in with what's already been built in the area. With so many stake holders, land owners, businesses, educational institutions, sporting bodies, etc involved, this will take a long time before a proposal for the whole area is negotiated, funded, completed, and ultimately made public. Not to mention trying lure the universities to the east of the city.(in essence asking them to split up a piece of their campus, when they are currently investing £1bil in it, centralising it on Oxford Road, and closing the North Campus in town and selling it off)
It does state in the PDF document that the Collar Site down to the gas works will be leisure and retail. So nothing has changed there. It's the other parts of the wider proposal that maybe holding the overall proposal back, due to the complex nature of what's proposed and the talks and negotiations taking place. Until everything is in place, nobody involved will go public on it. We just have to keep on waiting. (that aside, no news on the NS expansion is a bit of a pisser)