Yeah I saw that clip from siggraph.
It's a great move by Dax, having SideFX be interested in integrating Gaea directly into Houdini.
In many recent games you see a mixture of WM terrains augmented with Houdini procedurals etc., but the workflow is cross-platform.
Now game studios can have art-directable terrain creation tools right into houdini.
With this one move WM will be pushed out of the market, eventually.
Very clever, great move by Dax.