I'll give a try to Civ 5, I just hope it's not too 'different' from Civ 4.
For example, I've been playing Starcraft 2 Beta for the past weeks and, while quite different from the original, I like it as it uses basically the same ideas.
I haven't played Civ 3 since I got my hands on Civ 4 so it's hard to say... either a full conversion or I'll stick to 4 until 6... or 7
Starcraft 2 beta!!!
I have not be lucky enough to get access to the Beta test ...
Damn!!!1