well, originally, they were planning on porting all the HL1 mods (well, the valve ones atleast) to Source. All of them from CS to DoD to TFC to Ricochet to whatever i'm forgetting. but that hasn't happened (yet? or ever?) and i don't know if they still plan on doing it or not.
there's an old interview here
where Gabe says he plans on porting them.
and there's a shorter, better article here
, where they have Gabe promising that the stuff would be ported.
will it ever be released? i dunno. i know TF2 is higher on the priority to Valve than the other mods, but we've atleast got them quoted as saying they'll do it.
fortress forever looks really good and i've got high expectations for it. it's not out yet tho, and i don't think it'll be ready till the beginning of summer or so? anyone know for sure?