I have its look-alike predecessor, and have found it to be fantastic. Compact, light, comfortable to use, and powerful enough to snap most screws if you bang away at them.
They don't really say, but I would assume the brushless motor is similar in operation to Festool's (i.e. a 3-phase AC motor with electronics to generate the 3-phase AC from the battery DC)? Also, it appears that the three speeds are electronically set, rather than via gearing (can't see any shifter on the picture)? I haven't found battery life to be a problem, but any increase is always welcome. Plus, as Festool owners know, the brushless motor means a very long life without maintenance. I think some competition in this arena will be good for everyone.
I'm puzzled, though, by the three speeds. The existing model is electronically continuous variable speed, so what is the advantage of having three ranges? Why not just "throttle down" for smaller fasteners?
Steve