I caught that comment too and got excited for a moment at the thought. That'd be great for Ziggler. There really is no brand-extension anymore, so why not have a unified World Title? Win the Rumble and cash-in on the same night and then win the WWE title at WM to unify them?
Then have Cena win it the next night on Raw and make everybody happy!
(that's sarcasm, by the way)