No. Comio S1 does not the face recognition ability.
Comio S1 does have a very decent battery back up. It has 2700 mAh Li-Polymer non-removable battery which offers almost 15 hours of talk time and up to 143 hours of stand by period.
Comio S1 dimensions are 149.2 x 72.6 x 7.9 mm.
No. Comio S1 does not have dual rear camera. It has single lens camera with 13MP resolution.