Awww yeah. They were never going to be able to keep it a secret, were they? Jon Snow himself has been spotted in Belfast (the cast have been assembling for table-reads and to start filming Season 6) and whilst I guess he may be there to play a corpse I'm pretty certain this is finally the confirmation we need in relation to whether Jon Snow lives.
Book readers have expected Jon will be resurrected anyway (R+L=J, we all know that). Plus I've seen a rumored location for the upcoming season and it looks an awful lot like the Tower of Joy, couple that with the returning Bran's flashbacks and we're in for a pretty major season. Shame it's another year away...