A fine bit of nothing..
There's also a secret browsing mode that goes beyond “incognito” windows by requiring user authentication, by protecting and encrypting browsing information (El Reg bets the FBI will just love this).
That's a bit like Microsoft adding anti-virus to Windows and claiming it's safe whilst leaving the broken fundamentals untouched, something they still do. If you want to know where you stand it may be worth your time actually reading Google's Terms & Conditions that you have to agree to to get stock Android to actually work. It may be even better if you go into the archive and read the first version of it as that used to be more direct in its use of language. The new agreement is pretty much the same in content but just uses less alarming words.
You may have acquired a new shiny lock on your front door but it will make little difference to address the large gap that once was your back door.