The new Rebel coming next week is apparently going to be called the “T2i”.
New LCD (Even Higher Resolution)
Selectable FPS (Video)
New build quality and shape for a Rebel
No articulating screen
New battery LP-E8
New battery grip
CR Editorial about Articulating Screens
I don't think Canon will introduce an articulating screen until we have a faster liveview autofocus technology. There are situations that an articulating screen is handy on an SLR with the current liveview performance, however I don't think it's an issue for a majority of SLR users.
Canon has probably focus grouped this feature to death.
That's just my 2 cents. :)