No idea, but I wouldn't be surprised at all. Bethesda hate exploits more then anyone. They tried several times to fix the dup glitch and others in Oblivion and in the end truly couldn't "banish" it forever. There's just different METHODS of doing it.
So I'm sure they prolly fixed it almost all the way.. but there might be another method of boosting no ones found yet.
Get what I'm sayin'..?