I know this doesn't have a chance of happening but a GTA in London or something would be sick
London would be shit imo. A return to Miami or maybe Las Vegas would be good.
They can't do LA again and New York was shit on GTA 4.
If it's not in the US then Mexico perhaps. Or several cities in Central & South America.
Hopefully they're working on a red dead redemption 2 before another gta.
Red dead >>>>>