That would be because the creator of that map, as well as the creator of the "Crossroads Mall" L4D Campaign, as well as a few other maps, decided to leave us and throw his maps around to other teams. We got all but Harvest back as it was released with ZPS. Oh well, as long as people remember...
The leak was from before we got our last coder who did some great work, which was unfortunate. It gave us a bad name of sorts, but whatever, people need to realize it's a leak. Let's just say we have people leading up the team now that live and breath Game Design, and we know what we're doing...
Er...It'll all be updated with a full compliment of our textures and models in due time. For now, and for us to get testing quicker, we're doing it all in HL2.
(No More Room in Hell: A Half-Life 2 Co-operative “Zombiefication”)
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Two weeks. Two weeks ago everything was okay; two weeks ago the world was working, going about their business...