So, the sequel to Fast & Furious seems to be coming with Fast & Furious 4.
It is confirmed that Vin Diesel is back and also a few other of the original crew. The setting is said to be Rio de Janeiro, Brazil.
Another rumour says that 4 will be a prequel to 3..happens before the Tokyo Drift one.
There's already an IMDB entry for this:
http://www.imdb.com/title/tt1013752/