Hmm, what’s going on that Sunday that Survivor is changing it’s schedule?
Survivor ratings are very strong against American Idol, and going up against the reveal show for the finale with Survivor’s finale appears to be the last shot. It looks like they broke up the last episode of Amazing Race to stretch it out another week to fill the Sunday slot that Survivor typically takes for the finale. (Dang it, I hate 1 hour last episodes of Amazing Race...)
Here's an article about it by Dalton Ross at Entertainment Weekly:
'Survivor' finale moves off Sunday night for first time in 12 years