The Half-Life 3 speculation mill has been running hot over the last few months. G-Man's voice actor Mike Shapiro rang in the new year byposting a video in which he refers to «unexpected surprises» in the staggering voice of Half-Life's dimension-hopping villain.
Before that, evidence that Valve was working on a «Project White Sands» was revealed on an actor's website—White Sands referring to an area of New Mexico where Black Mesa was supposedly situated.
Now, Reddit user Relevant_Basis5444 hasspotted that Valve's Steam page currently lists two projects beneath its «Upcoming Releases» tag (via Eurogamer).
One of these isDeadlock, Valve's third-person MOBA, which is currently in development, and technically unreleased despitethousands of people playing it right now.
The other, however, is hidden from view. It's worth noting that Steam developer pages can hide games from view depending on your filter settings.