Indeed it is, simply due to the licencing issues. I think either GT or GT2 stands a good chance of being on this system (I’d bet on GT).I don't know how Sony is making its decisions. I just outlined why GT and GT2 are unlikely due to the high cost of licensing.
My hunch is Tekken 3 is a title Sony feels will sell the console. To my knowledge, it hasn't been offered elsewhere before and this is the first "re-release" of the game.