It is worth mentioning that this could still easily be an angle, especially considering the announcement been spotlighted on WWE.com with a potential retirement tease and Vickie Guerrero posted a message to Twitter promoting the appearance. It is not confirmed either way at this point. It does look more and more likely that it's legitimate considering his tweets to numerous celebrities.
-- During filming for the new "Total Divas" reality show for the E! Network featuring WWE Divas, the show does acknowledge the current relationship between Nikki Bella and John Cena. Daniel Bryan talked about also being filmed for the show as he is in a relationship with Brie Bella. It wasn't always a given they would reveal Cena as being in a relationship with Nikki given his position within WWE.