IPhone overheating, sending massive amounts of data after iOS 5 update

After finally upgrading to iOS5 on my iPhone 4 yesterday, I unplugged it and went to work today.  In 2 hours with almost no usage battery was down to 32%, phone was very hot, and checking my data usage it was up to nearly 1GB this morning.  I closed all apps except mail, phone and did a reboot.  Now, in the last hour it's used another 90MB.  What in the world could the phone be doing to cause this?

There's multiple threads in here already that cover this, but here's my take:
My wife's 4S has this issue as well (200MB plan) and it used 130MB in one night at 12am while we were asleep.  Interestingly my 4S does not have this extrenous 3G data usage.  So I turned off 2 settings with hers that will hopefully help, but will only know as time passes.
1. Settings > iCloud > Documents & Data > Use Cellular > OFF
2. Settings > General > About > Diagnostics & Usage > Don't Send
I think #1 will definitely have an impact to cellular usage, I doubt #2 will do much.
Also, if you're really paranoid you can turn off photo stream and iCloud backup however, both of those say it will only use Wifi data for each but who knows...
My .02.

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