AMA was very underwhelming. Gabe did not 'hint' at anything. He answered 20 questions or so, in a sea of 10,000, in a mostly 'yes'/'no' format. I think alot of people were hoping this was some sort of announcement, but it was mostly talking to a wall or a magic 8-ball.
When asked about VR and future developments he basically responded that Valve is into VR and developing VR hardware. Um...obviously? Anything specific? No.
When asked if they were developing a new IP or any sequels to their longstanding projects, he said they are always developing things. Um...well...that's not an answer. People understand how development works at Valve. People were asking if there was something pretty far along the way, that was out of project/concept phase and in ACTUAL development. He danced around it, so we can surmise the answer is, 'No'.
The only questions he really responded to, were personally related and not Valve related. I mean...he must know people were addressing him as the head of Valve and thought the AMA was a tease for something. Nobody cares what Gabe likes at that Valve snackbar, though he responded twice to this question.
It was a very irritating AMA.