My guess is you wont be keeping this phone for long. Nokia or Microsoft will eventually approach you and replace it. So make the best of it by documenting all changes till then.
Where ever you believe there are additional features, i'd strongly suggest taking a screenshot and sharing here. Even the smallest of changes need to be shared.
Any features as mentioned here?
Claimed list of Windows Phone 8 GDR3 features leaked: Updated | WMPoweruser
I'll be back in a few hours...but here's what I can confirm right now.
Orientation Lock (see screenshot)
Driver mode (Will upload screenshot in a bit)
Close apps via multitasking (see screenshot)
Silent NFC (don't have anything to test this with)