GTA Tokyo would be pretty awesome, as would GTA London. 
 
Modern day Vice city too... damn.

FRANCE! 

A country that isn't America. That would be refreshing.

Tropico! Wait...

Honestly, I'll be happy with whatever they do.

Somewhere European i'd say... London is a good choice. So is Tokyo.
 
Russia would be pretty cool also, or somewhere in Eastern Europe with lots of snow.

I want the large tri-city layout of San Andreas (maybe minus the empty forests and the barren deserts). 
 
Fuck the haters.

Mexico or Brasil.

FINLAND!

Monkey Island.

I don't care, as long as this game happens soon.

I think Tokyo would be awesome.

hong kong

" @Andorski: I never understood the san andreas hate...SA was fucking RAD! "

IRAQ

SPACE! the final frontier 

American immigrant in Japan. Lot of shit to lampoon.

Anywhere new.

" Las Vegas. "

I would like to see some southern city like Atlanta or Dallas.

" @insouciant said:

" Las Vegas. "

San Andreas saw Las Venturas which was Rockstar's rendition of Las Vegas. :P  "

 I clicked Tokyo before I saw London.
 
 

San Andreas

Didn't I just answer this in another thread? 
 
... well whatever, I stick with Paris or Tokyo, but Rockstar can only do American satire. I very much doubt they have the capability to mock another country's culture simply by not knowing what it is.