The TrackMania United Website (thanks Frans and Factornews) reveals plans to release a consolidated package of all the games and add-on's in Nadeo's racing series. Word is:

TrackMania United is the complete TrackMania game. It regroups all the TrackMania games released until now and all their add-ons. The Stadium environment from TrackMania Nations, already played by millions of players, will benefit from a new version with twice more blocks. Finally, TrackMania United integrates a whole new set of functionalities both for online and solo play, which will further extend the possibilities of the game and renew the interest of all the veteran TrackMania players.