As regards gearbox/transmission, the forum fellow who managed to disclose the precise engine type that will power the M2, also disclosed that the M2 will be offered as manual and automatic.
So - except if BMW has changed its mind in the meantime (as they did for example by shelving the 4-cyl plan for the M2 in favor of a 6-cyl) - the choice will be yours. Your next problem might be that you cannot make up your mind to choose.