Black Mesa, the Half Life remake, will be releasing on Steam with Valve’s full blessing as a low priced game. The announcement was made on the Black Mesa forum by Carlos Montero, the game’s project lead. However, this wasn’t the only big announcement that was made.
“Over the past year, we have spent a HUGE amount of time porting the game to a new engine and fixing hundreds of bugs. The work to port to the new engine was not because of the decision to go retail, this was work that had to be done to get Black Mesa onto Steam and support our future plans.”
One of the forum members asked if this was a Valve engine with the reply being, “Do you think we’d have a license agreement with Valve if we were on another engine?”
So this could be an updated version of the current Source engine, as that is what Black Mesa is built on, but there is the possibility the game could be using what could be Source 2. There’s no confirmation that the engine yet exists but it is likely, though it might not go by that name.
Other details were also announced in the post including an updated free version of the game, and plans to open source all the maps and a selection of the assets.