Is there any word on this? A lot of people talking about the big desync issues seem to specifically say that their ping is fine. My friend just started playing and his ping just shoots way up (into the hundreds, sometimes over 1000), Desync goes to 100000, and then it kicks him. It seems to be related to people being around him. It's also possible that it's CERTAIN people. I can't seem to go near him at all for example. The one time I was able to get close to him it was because he logged in while I was waiting in the spot he was at. He walked around a little but I was invisible to him and then it kicked him off after a minute.
EDIT: It's DEFINITELY related to being near me. If we manage to get close, I can see him but he can't see me and then it just desyncs for him until he gets kicked.