What's new in the update after denim?

[SeattleSeahawks]

I recently bought the black and gold 930 and upon opening I had the denim update. Last Friday I got a message saying there was another update for my 930 so I downloaded it and not sure what's new if anything. My atnt 1520 just got denim and after I updated the 1520 I compared the numbers and my 1520 isn't on the same 8.1.......... Was wondering if any of knows what was in the recent update, probably just bug fixes but my 1520 didn't receive the update yet.

 

[sarim_xyz]

I also got an update for my 930 (HK variant) recently, after I had updated it to Denim. It gave me a newer firmware version and it also showed some sort of "Lumia Update". However, I also didn't notice any changes.