I don't know either, but I think there is a chance. A while back Vince was considering turning Cena heel at this years Mania. This was before Cena became a member of Nexus.
I think WWE knows Cena as a face has run a course and is hurting their product or may be a better word is holding back their product.
At this time, change doesn't seem likely, but I guess we'll get a better idea as the weeks lead up to Mania.
I noticed Smackdown didn't censor The Rock's RAW promo.