His 'not a goodbye' could just as easily refer to the fact that he's built a relationship with much of the cast, not to whether or not he'll return to the stage.
(Of course, it could mean just that as well.)
Broadway Star Joined: 12/7/05
GreenDay Broadway was such a great experience. Best Cast ever! Hopefully I'll do StJ again. If you haven't seen it, ****ing see it! Its great! Xo bJ
about 2 hours ago via ÜberTwitter
This is Billie Joe's most recent twitter post. Sounds like he's definately open to doing this again. Either way, I love how supportive he is of the show. He's always complimenting the cast.
Direct link: http://twitter.com/GreenDay/status/26504633129
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