Well the TPW is just that... a target. My dealer didn't even want to talk about it because he's seen it change so often and has no confidence in that date.
I think the information in following thread has something to do with all of this.
http://www.camaro5.com/forums/showthread.php?t=16558
If that's the case... it may just be a matter of time before a workbench update occurs that informs all dealers of delivery dates and is somewhat consistant.