No, Jak X hasn't been ported or rereleased since the Playstation 2.
It is such a shame because my wife and I are huge fans of the game. It would be a guaranteed purchase if ever made available, particularly if given HD treatment.
Well im emulating Jak X on my PC right now and forming a plan to get some netplay going with friends!
I posted in another thread, if Jak X were remade I would buy a console just to play it. Best combat racing game ever made!