Well, I have a cautionary tale that might help to clarify the situation. Yesterday, after maintenance in the US, inhabitants of very recently connected realms Nesingwary and Vek'nilash happened upon some highly unusual issues. Players were logging in and discovering their characters were gone. Disappeared. And players who could still see all their characters on the login screen could only access a few of them.
Other players weighed in with their stories of being unable to access guild banks, guild bank logs being years out of date, and more. 14 hours later, at the time of writing, and it only seems to be getting weirder, with characters flagged for rename, and duplicates or copies of long-deleted characters starting to appear. Players are starting to panic and grabbing their names with level one alts for security. Blizzard blue Vrakthris has been doing his best to help, giving players a code to put in tickets so they could all be dealt with swiftly, but this doesn't seem like it's been resolved just yet.