There is a listing for an unannounced Far Cry expansion on
Play.com (thanks
YiYas), though
Frans
points out a
Gameplay listing for this appeared
some time ago.
The listings bear two different release dates (August and October, respectively)
for the untitled project, nor are there any details (besides "Requires Far Cry
to run"), thought Gameplay's page does list Far Cry publisher Ubisoft as the
publisher of this project.
Update: It turns out this expansion was
actually first revealed in March (
story) as part of Ubisoft's
2005-2006 product catalog (thanks
Tiscali Games).