I checked with a source at PI last night and he said that while groundbreaking is behind schedule, T-REX is still coming.
As everyone knows, it's going to be built in that traffic circle/drop-off area near McDonald's, adjacent the E parking lot. I believe they used to operate valet parking from that location.
Don't have an opening date for you. Before August, 2008 seems doubtful but that's just my opinion, not anything official.
BobK/Orlando