Well I really don't need to upgrade, but my next upgrade will be this summer. I am planning on getting an:
Intel Haswell i9 Quad-Core GPU-GT3 with
memory: 16GB (4x4GB) Samsung* Dual Channel DDR3-1600 or better
storage: solid state HD 6Gbs or better
video card: GeForce GTX 780

All of this 20nm Gen 2 hardware is supposed to be available by July 2013. The GTX 780 was supposed to be released in Feb but apparently is delayed by manufacturing problems. The CPU was schedueled for June 2013 but we'll see. This machine should be ready for the new SE graphics Luminous engine. I doubt Luminous can run at internet speeds so it will probably be single player..