It's supposed to have better heat management, and the way I see it is-
The phone is better at dissipating heat from the internals to the case, which is essentially a heat sink. Meaning- the phone will feel hotter on the OUTSIDE, but may actually be running cooler on the INSIDE.
Therefore the people complaining (not you, OP) about it getting hot really aren't understanding that there's actually nothing wrong.
Of course I could be wrong.