Yeah, it's difficult to predict, we would know more by around New Years 2013. By then I would be nearly complete with my choices on a new CPU/mobo as my current one is aging. I'm still surprised on how good it is even today. The X58 chipset is indeed impressive to have lasted this long and still compete with the best of today.
I would like to buy the GTX 770 and use my current GTX 670 for PhysX duty as Unreal Engine 4 maxed out will most likely cripple even today's mightiest rigs. I think it will be the new Crysis that will take a few more generations of hardware to be able to play it maxed out, lol.
Theres rumor that the 8000 series offer 40% more performance than the 7000 series. The GK110 offer about 25% more performance than the 600 series. I will buy both in any case. Performance is getting ridiculous!