It's not that strange actually. You have to spend a lot of time making a demo for e3 and they seem to have been in crunch mode then.
The same thing with The Witness, Jon Blow also stated that they weren't at E3 because they were bugfixing and hadn't anything new to show.
Also Yes, do hyped!
Not even a snippet footage or even a mention is pretty weird though. With The Witness I just figured it's still a long ways off, and that's what I thought of Rime back at E3.