Valve may be gearing up for an interesting few years, as it seems Erik Wolpaw who helped write Portal, Half-Life: 2 episodes and more is now back at Valve.
The tip comes from ValveNewsNetwork and I've certainly got no reason to think it's not true as McVicker does some pretty decent Valve coverage on YouTube. On top of that, Wolpaw is actually listed in the credits for Artifact (see here).
We know that Valve do have multiple titles in the works at the moment, so bringing in more people isn't exactly surprising. They recently released Artifact, In the Valley of Gods is coming since Campo Santo joined Valve and they have others they say are "top secret".
It will be interesting to see what they're doing especially since Valve is possibly making a VR Half-Life game. It's certainly going to be a fun year.
I just want to see a new Left 4 Dead game, is it too much to ask?
As always, I've reached out to Valve to confirm it too just to be sure.