Just downloaded my copy from Steam last night, pretty interesting gameplay. They've made a ton of changes to it.
I am reading into Civilization V, both IV and III were brilliant turn-based experiences without a doubt. The changes I've seen so far are minor, they introduced a hexagonal grid and that's not getting me very hyped. I have yet to see any changes that are really going to put me on the edge of my seat.
For now I'll hold out, Civilization IV Fall From Heaven is still keeping me occupied on the strategy front of my gaming life. :|
As a digression, are you a new administrator? Or is it simply an activity spike?
I have heard that Civ5 doesn't live up to the Civ legacy. People have said its more simplistic and less detiled. I don't know for sure, I downloaded the demo but have not yet played it.