See the other rumour threads about the 2003/2004 STi that will be coming here. That's the way you'll get a 6 spd. tranny.
You won't see that many changes in the WRX for MY2003. Perhaps some small cosmetic changes or manufacturing changes to improve the existing car or to aid in the actual manufacturing process (those you won't hear about...typically cost savings methods.)
I'd like to see a change/addition of the dark blue that the TS model is offered in to the WRX colour choices. IMO, much better than the WRB (although WRB is a classic colour.)