This is how we plan to release in the coming months:
Technical Beta - This will be a couple of maps to test the latest engine, and test the performance of our maps. This will be public, but more or less of a stealth release for people who are interested in helping us test. This way we can test on a lot of machines quickly, and have time to implement any crucial feedback.
Open Beta - After we have implemented the feedback from the technical test, we will push the entire game to open beta. This will give us testing for the rest of the levels to again make sure the game releases as smooth as possible.
Release - Though we are expecting all the betas to run well, if you have been waiting for the full Black Mesa experience, this is what you want to wait for. Once we know the beta does not set people’s machines on fire, we will switch the full game over to the main Steam branch and announce its full release! After this, we will continue to monitor feedback and ideas from the community for Xen, and release periodic bug fixes and updates.