I believe they have been in the process of making it since Half-Life Source (the original, but with Source physics) came out. They felt that it didn't do the original justice, so they've been remaking the original since. It looks like they've been doing an amazing job, and hopefully it will be released sooner than later. (All of the original Half-Life remade, and the multiplayer levels as well)
That map you are working on looks decent! I hope it is well received when you release it!