The release date for Half-Life 2: Episode Three is currently,
said to be sometime in 2012... of course, Valve has not released an
official release for Episode Three, but said to expect it in about
2007. Four years later, an official release date has still not been
released, nor has it been canceled. For these reasons, many fans
have been complaining/worrying that Episode Three is just
Vaporware. (Vaporware is something, often some sort of software,
that is promised by a company but is never really released or
officially canceled. Vaporware is usually used really only to hurt
the sales of competitors.)