Some kind of modern HoI ... that's what i'm waiting for. Especially for the period from the mid-60s until 1989/90. there is no such game or mod on the market and i think that the cold war offers a plenty of possibilitiys.
there are nato and warsaw pact, many many events and more then enough new techs like choppers, sam-systems, different sub-classes (SSN, SSGN, SSBM, ...), tanks and and and ... more then enough stuff for a cool game.
also the cold war-period offers a better background for spying, diplomacy or trade agreements (building mig's for china? selling sam-sites to france?). the possibility of changing divisions for let's say raw materials like in hoi is nice, but i think that there is more potential in this option
by the way: i always wanted to play through a fictional conflict between nato/warsaw pact. but on good old hoi-level and not within a real-time game such as the funny but unrealistic Red-Alert-Scenario