iPhone 6 64GB turns very hot (all the time) after installing ios 9 beta1. Resetted software 3 times, allways same issue.

Mine was hot right after I did my restore, but it doesn't seem to have an issue with heat after restarting it.

Mine was hot for the first 8 hours or so after I installed it yesterday. But then it started cooling off and today it's not warming at all.

I'm not sure what it was doing. Perhaps spotlight was indexing stuff? It's fine now though.

I restarted and hardresetted, same issue. Do you have other settings, did u a clean install or an update?

This is interesting to hear, but I hope they´ll fix it within the next 2 weeks.

Let me add this question: Was the battery life better after this 8 hours?

Yes. But then today I had another period where it dropped again. The battery section of Settings seemed to think it was the WWDC app's fault. But I think there's something else going on that isn't showing up.