When in doubt, turn to Wikipedia:
http://en.wikipedia.org/wiki/Starcraft_Ghost
Quoting from the article:
On March 27, 2006, Blizzard announced that they will
"indefinitely postpone production". [3] Most of the fan community
has speculated that the game is cancelled, since the game was
previously removed from the "in development" list at the official
Blizzard website, and the official page for Ghost now redirects to
the Blizzard main page. In addition, IGN has stated that it has
been cancelled. However, there has been no official statement from
Blizzard as of yet. Cancelling an in-development game that is
nearly complete is not new to Blizzard; the same thing happened in
1998, when Blizzard cancelled the highly-anticipated Warcraft
Adventures: Lord of the Clans adventure game after nearly a year in
development.
Though of course, things might have changed in the five months
since March. Could you provide your sources, Gordy?
