Sounds like many things have been learned from Civ 4 and some of it's fallible code. I am looking forward to a rewrite of Civ 5 that will have smarter code that will not lag machines, not create connection issues in multiplayer and give the players more flexibility. (Being able to see Civilopedia in the multiplayer staging room or, having more information available to them at that time, having a better MP gathering arena, and implementing a better filter system. With some research and effort, the MP Lobby could be so much more friendly. And hopefully for god's sake, have it's own server instead of an unreliable liaison.)
Edited 09/11/07
Edited 09/11/07