Dude, they're discontinuing the Celica - with next year as the last production year. They will no longer make this incredible car, the Celica, and also no more MR2 Spyder.
Nothing. End of 7, end of Celica.
...Maybe like 10 years later, they might reconsider and design a generation 8 - but that's later, maybe way later.
So yeah, I'm deciding between getting a GT or a GTS.
My understanding is, the Celica will still be manufactured for sale in Asia (and possibly elsewhere), but not made or sold in North America. So you could still get a Celica by buying it overseas and brining it to the U.S., or wherever you lived. But it won't be easy, or cheap. They may be coming out with an 8th gen design to go into production in 2006.