As I understand it, the next update should be 4.1.2 which, according to a 5 second internet search, contains bug fixes as well as improvements to performance and stability. But I don't think anyone has a clue yet as to when this will be released by Samsung. My money is on them jumping straight to 4.2 instead. The only bug I've found with 4.1.1 so far - and it's a trivial one - is that the default keyboard reverts to being the stock one every time the phone is restarted.