It is most likely to happen that the next part (which will be released around October) will either be a remake of Most Wanted(2005) or a new part, based on the first one as Most Wanted was -atleast in my opinion- the bestseller of the series. If not, then alongside Underground 2.
Only a few days left until the E3 Expo 2012 starts and we'll see trailers of endlessly many games, leaks about new games, about older games, anything you can imagine again. Let's just hope that this game will return to the roots of tuning and proper police pursuits.