Tibby. Allow me to explain. The black mesa team is a talented and smart group of people. They have released lots of media, as a matter of fact. They have shown screenshots from every chapter except Xen (which they are keeping under wraps until release for hopefully obvious reasons), and even videos of some of them. You want your proof that gameplay exists? just watch the trailer that was released last year. They made that trailer state the year '2009' not for the public, but for themselves. They believed that if they set a deadline, even one as vague as 2009, then they would be motivated to work harder. And it worked. Unfortunately, they came to realize a week or two ago that they would not be able to make 2009, due to real life circumstances. Thus, they made a post in the news section of the forum stating they are sorry for not making 2009, and promising an early 2010 release- they're very close! So basically you should be glad they didn't release in 2009, because it is still unfinished, and the released version would be buggy and disappointing. They are making quite positive they release a mod that, in their eyes, is complete. And they have very good standards. They won't **** it up.
DO NOT WANT.