Can't say yet. We are still working out server/networking stuff, and trying to determine what is server or what is client. This is not official, but I would say that the GNCD save issue and sculpting tool issue will be high on the list. Disconnections and slow menu load time and performance are high on the list (though I think these are server related and, hopefully, have seen much improvement already.
We are going to post a status update later today (or maybe first thing tomorrow) as to where we are at on many of the issues we are dealing with right now.