Will the Metabones speed booster for M43 be a NEX cast-off?

What I mean by this is, does anyone know if the M43 speed booster will simply be the NEX design with a different register distance, or if it will actually be optimised to the M43 sensor size?

The Metabones speed booster effectively reduces FL by a factor of ~0.73 (I think), and increases aperture by approximately 1 stop. Because M43 has a smaller image circle than NEX, a speed booster could be made to reduce the FL by a larger amount, and increase aperture by a large amount, surely?