So there was a hidden update in the presentation. Notice how the one guy made a big to-do about "keeping it chill" when he was asked about game development? And how all the other panelists reacted to it? That was definitely a hint. If you then watch during the Risk Shadow Forces segment, you might see this:
That box on the left that I call out in red is a new version of The Frozen Horror, the third expansion released in the US. Like the Kellar's Keep right next to it, this is a new box with very similar art, not the original Barbarian Quest Pack box.
So yeah, they might not have been allowed to talk about it yet, but they basically confirmed an additional expansion is in development. I'm guessing The Mage of the Mirror won't be far behind. I'm especially interested because I never learned about the additional expansions until just very recently, after the Haslab campaign. Never saw them in stores around here. So these would be all-new content for me.