I am a big Wargames fan and I just stumbled onto a game on WWIII called Defcon by Introversion. The screenshots are kick ass. I am downloading the demo right now. Looks like the game came out late summer 2006. You can read about it at Introversions website
here and at Wikipedia
here.
I am excited about this. Probably about as close to a role playing game as I would ever get. Cool!!!