I read somewhere he would consider endorsing her if the democratic party adopted a few things for the official party platform that would ensure more progressive politicians and policy positions in later elections, something like automatic voter registration (something I think Clinton has already proposed) and eliminating closed primaries, etc.
I suspect he will endorse her at the convention because he doesn't want a republican to win, but I really hope he gets something out of it that makes the party more progressive, otherwise, fuck the democratic party. Part of the reason most of us don't like the republican party is because they're largely establishment shills, so if the democratic party is that too, why the hell would we support it? Doesn't make any sense. Party favoritism only hurts the individual and helps the establishment.
All of us know that's the only thing it means, he still believes everything he's said during the campaign and if the GOP nominee's weren't as crazy as Ted Cruz or Donald Trump, and the Supreme Court wasn't so important next cycle, he would probably tell her to blow him, as he should.
The good thing is his presence this election has already opened up many opportunities for the future. More people are actively involved than before and the tide has been gaining momentum since Obama won, we're winning by multiple indicators