Like SC said, all of the land has been zoned and already has a plan in place of what they want to build down there. I live about 100m from the Pinderfields Hospital side of it and have been to meetings to see the plans and have been sent info on it quite regularly the past year or so.
It's meant to take 15-20 years to eventually complete, but on the old strawberry fields/Pit area they plan to eventually put most of the 2500 houses plannned for the area. I think some others around 500 are to be wher the Power Station was. Plus a new School, Health Facilities & the Industrial units are supposed to be built on the old Sewage Treatment Works. The owners of the site as far as I know, are WMDC, Miller Homes, Stretton Property and Keyland (basically Yorkshire Water).