Yes, Vivo V5s does have softlight feature.
Vivo V5s has dual core GPU.
Vivo V5s has 3000 mAh battery which is non-removable. It offers talktime of upto 12 hours on 3G networks and standby time of about 270 hours.
Not at all. We have used Vivo V5s during our reviews and found that despite using for longer hours, we did not encounter any heating issues.