Another new bit of info from an interview with Dennis Shirk
Dennis Shirk: One thing we didn’t even talk about in the demo is the strategy view. If you turn it on, it makes everything into a flat 2D hex grid – just like you’re playing a boardgame. Or, if you’re on a plane or something and you don’t want to worry about the high-end graphics, just turn on the grid and it’s totally playable on this 2D map. Like you’re playing Risk or something.
So yeah, if for some reason you decide that you hate 3D and wish the world was 2D like in the old days, Civilization V lets you do that