Did Dempsey tweet 'Grey's' spoiler?

We know Eric Dane is on his way out of Grey's Anatomy, but could McSteamy be joining Lexie Grey (Chyler Leigh) in that big hospital in the sky?

Source: http://rss.cnn.com/~r/rss/cnn_showbiz/~3/hKCDoH-jlis/index.html

Cliff Allison Fernando Alonso Giovanna Amati