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Sometimes after an update, the phone will use more power for a few days. But after that, it should go back to normal.
Heat can, of course, cause battery loss as well.
From my experiences with phones, only 3 things can cause a phone to heat up. First bad cell reception or bad Sim card. Then, of course, charging then phone and last a rouge app or just an app that hasn't received a proper update for your new OS upgrade.
I always factory reset my phones after any upgrade. This lets me start out with a clean slate. I reinstall my apps an almost always every little issue is fixed. At least today resets are not as time-consuming as they used to be especially if you have your phone remember your apps sign-ins and passwords.
Now if you still have the same issue after the reset, I would then call customer support for a replacement.
That AZ heat is no joke, slkphaz! I have to agree with what hitherdread mentioned above -- have you had a chance to reset your phone after the update? That's usually my first recommendation if a device is acting up after a software update. You can also take a look at other info on the device getting hot over here: Hot or overheating phone.