Don't expect it to come... I talked with Keith about it this week. Evidently he's seen some fork of it on the G45 internally, but they just don't have much interest in it anymore.
You can use a Hxx board, but you can only oc the gfx core with it. If you want to oc the cpu too you need to wait for Z68 boards, most likely next month. Pxx does not work.