I had my first rollout with the GM Brushless System today.
And all I have to say is: Amazing!
Loads of power and insane bottom end rip.
And I even didn't use the most powerfull motor. I drove a 6T motor with 330 watts. That was more than enough on a tight carpet track.
The new ESC (Genius 95) and the new IFMAR motors (4.5T and 5.5T are already available, the 3.5T will be new) will be available by the middle of the year. The new 3.5T is expected to be above 500 watts.
You can see the possible combinations of motors and ESC's at http://gm-racing.de/