No. During our review, we do not observe any heating issue.
Yes, Micromax Canvas 2 comes with Corning Gorilla Glass 5.
Micromax Canvas 2 comes with 3075 mAh battery which is enough for a day's usage. It offers talk time of up to 8 hours on 4g network and about 250 hours stand-by time.
No. Micromax Q4310 do not have the hybrid sim slot. There is a dedicated memory card slot in this phone.
Micromax Canvas 2 is made of Metal and high quality Polycarbonate material. The front of the phone is covered with Corning Gorilla Glass 5.