I just read the Feb issue of SubieSport magazine. The had a picture of the ESX special edition STi scheduled to be available in limited numbers (whatever that means) in January 2005.
I supposedly packs 425HP and a host of other refinements and upgrades.
They don't list a price, but that's not a huge omission for me, I doubt I can afford it, anyway. The pic's georgeous, though!
Philip