What you've experienced is commonly known as the Badass Rank glitch. If you check you're Badass Rank you may have lost some or at least had your Bonus Stats turned back into Badass Tokens.
It's not specifically this last update. I've had it happen to me twice once about two weeks ago and again about 5 days later. I think it was the Hot Fixes that were doing it to me.
Both times my Bonus Stats got turned back into Badass Tokens. I also had my Golden Keys changed to 11 but I had significantly more each time. I lost 70 keys total. As for the skins and heads, you lose any customizations that you received from drops. Any that you got from challenges or mission rewards are safe. I learned that from contacting support which I suggest you do. The more people who report this the more likely they will try to fix it.
http://support.gearboxsoftware.com/home --- "Bingo!!!" - Bayman, Dead Or Alive series XBOX Live Gamertag: Vlad Impaler7