Ok I realized something new.
If the lock screen shows the clock, the device cools down..... I think....
It is possible to list the apps that may heat the phone with 10149 build installed?
My bet is just wait a week. My 1020's battery life has significantly increased since I installed last week - from 25% an hour to 5% an hour today. It's almost back to being on-par with 8.1 again
Okay.. i got this fix actually since the first time installing
disable all of your background apps, except something u use such as WhatsApp/BBM/Line or path etc...
turn of autoupdate of new Store (beta), go to store -> settings ->turn off auto update..