Update:
With roughly $120 in hand, TCU had the money to complete the East side, but TCU staff have been told there's been a project expansion. They're going to build a new all-sports weight training complex between DMC and the Schollmaier and Baugh practice facilities. The old Walsh weight training complex will be remodeled as part of the home locker room/equipment facility expansion.
This redirecting of funds (with the permission of the donors) leaves TCU about $10-$15 million short of cash for renovating the East side. They're fairly confident they'll raise that well before it's needed to complete the East side by 2012. They're just not jumping the gun by making any announcement before it's a fact.
I have no knowledge of any talks to change the stadium design to expand seating capacity. Doesn't mean no talks are going on, just that if they are, I have no knowledge of them.