Move shake-up/re-balance in preparation for PvP?

I've been surprised to see little to no discussion about a possible move shake-up or re-balance in preparation for PvP.

Of course it is all speculation, but before gen 4 launched there was lots of discussion on whether such a shake-up would take place. It seems to me this would be a ripe moment to do so, more than any other previous one.

It would certainly add another layer of strategizing, and with two charge moves it would make it even more difficult to guess what moves an opposing Pokemon could use.

Who else thinks this is more likely than not? What moves would you like to see substituted? What Pokemon are you keeping several of, just in case?