He decided not to release the bombshell.
He covered his tracks by saying he will release information over time, but this will be run-of-the-mill documents.
Why? He may be negotiating for no prosecution. He may be in fear for his life. He may be a Never Trumper.
I don’t expect to see a bombshell from Assange on Hillary before the election.
Somebody has already tried to scale the embassy walls. I am betting Assange got an offer he couldn’t refuse, a message of some sorts.