theres a new hl mod being released on the 1st of march. it's based on warhammer 40k and called "WH40K Rival Species". the gamemodes arn't exactly revolutionary with deathmatch, team deathmatch and capture the artifact.
judging from the media released the character models and skins are really good quality. the first release includes 3 different races, space marines, chaos space marines and eldar. each race has a heap of different classes too.
this release is only the first beta and they intend to add at least another 11 races over 4 betas.
http://www.rivalspecies.com/index.shtml