Wittes sent another "tick tick tick" tweet today and followed it up with this:
Maybe something solid on collusion between Russia and the Trump campaign? That would be my guess.
Wittes also just retweeted this:
Matt Singer @matthewjsinger
Fox has shifted to "collusion isn't illegal" rather than "it didn't happen." Trump now tweets "no tapes" rather than "no collusion."
So something collusion-related is looking likely, but Wittes isn't in a position to know issues like that unless they came to him through Comey. In other words, if someone doesn't trust Comey, they probably won't believe whatever bombshell is coming unless there's very hard evidence such as a tape or video.