I can't see it happen for the reasons already stated above about power conservation.

Also, wasn't the whole point of warning us about the server mergers in advance partly so we could empty out our inboxes and auction houses? I'm pretty sure people are not ready for the merge in this way right now. Not everyone got the message in game or offline before the servers went down. If the mergers happen while the servers are down this week (or longer), lots of money and items will be lost, and honestly... people WILL complain, a lot. So it sounds like a bad move. And anyway, character creation is down for the affected servers, so no one can ninja create new characters.

Anyway, I really do think they have much better things to do in this downtime than to work on updates and mergers.