http://www.jc-mp.com/forums/index.php/topic,2889.0.html
The test is from Dec 7- Dec 14. The download is 26 MB and you get your Steam keys through http://www.jc-mp.com/keys/Welcome to the very last JC2-MP beta test. It's been a long run, but we're finally ready to release JC2-MP to everyone.
Since August, we've been in radio silence, working hard on the mod. We've hinted at a big surprise, and we think it's time to finally let everyone in on the big secret:
JC2-MP is coming to Steam.
On release, you'll be able to download the client and server from Steam, just like a normal game. This means complete Steam integration, including joining on your friends and more.
Of course, before we release, we need to ensure that 0.1.0 is rock-solid. This beta test will let us work out the final issues, and give everyone a chance to play in the biggest demonstration of chaos this year.
On the day of the test, the game will unlock itself, and you can join the test server.
Two days before the test, we'll release a detailed changelog; and after the test, we'll reveal the release date. One thing is for sure, though: come hell or high water, JC2-MP is coming out this year!