Sadly, this game doesn't have any built in, well according to the gameplay.
any cheating we will be able to do will be from a trainer.
Edit: in Documents\My Games\Sid Meier's Civilization 5 theres a usersettings file that has a debugmode=0 line so changing that to 1 might give some options I'm gonna mess around with it I'll post if anything works
[Edited by BenSully, 9/21/2010 1:41:41 PM]
Still expecting these guys to come out with something this week for it (that is if they are playing it).
DebugMode = 1
; Set to 1 to activate the debug panel
DebugPanel = 1
; Set to 1 to disable OverlayDebug system
OverlayDebug = 0
Files are located in ~\Documents\My Games\Sid Meier's Civilization 5\
Once in the game press "~" to open the debug menu. You can reveal all, edit cities etc.