Probably will not occur however, I'd love to see Illinois and Purdue play a third time this season. Imagine that would put to bed all of the Big Ten chokes in the tournament talk for a while. Plus it'll be just plain awesome.
Realistically the final four will probably look like - UConn, UNC, Purdue and Houston - maybe, Arizona comes out of the West in place of UNC, all #1 look to be really strong this year.