EnI
Piston Pioneer
As green and clean is the new trend within automotive industry, it'd be probably a small, mobile carbrand with a reasonable sales volume like EnI pointed out.
It was said by BMW officials the "urban mobility solution" vehicle would be a premium vehicle, dynamic & fun to drive (like every other product within BMW Group portfolio), and the annual production volume would be around 200,000.
By the end of this year it will be decided what can of vehicle the car will it be (car or a hybrid between car & motorcycle: 4 wheels vs 3 wheels), what powertrain will be used (electric, hybrid, or fuel cell), and under which brand the car(s) will be marketed.
I'm sure all the decisions will be publicly announced at the and of the year, or earlier next year at some Chinese or American Motor show. Perhaps some design study will be shown in the near future as well (eg. within 2 years).