Website:"we'd like to officially state that we've upgraded to the Orange Box build of the Source engine. We're also excited to announce that we've dropped Counter-Strike: Source as a requirement for Black Mesa, and from now on, the only thing you'll need to play the mod is a Steam account with any Source engine game installed! Black Mesa is now running completely off of our own content and base Source shared content, and we felt the vastly increased user base more then justified creating all the extra assets needed to make this switch"
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"Moris should be here soon to rub it in my face..." -Pizza
rumor is that valve wanted to do this themselves but resource limitation along with low purchase expectations kept them for digging in, but have advised the team to remove the word "source" from the name in order to avoid legal action.
If valve picks this up and releases it themselves I wouldn't be surprised but I wouldn't be surprised if legal entanglements sends this to oblivion either.
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"Moris should be here soon to rub it in my face..." -Pizza