Blizzard uses to cancel around the 50% of their productions, but one hurt more than the others and was StarCraft: Ghost. Nihilistic Software started the development of this game and was continued by Swinging Ape Studios in 2004. The work on Ghost was stopped in 2006 and we had to wait until to 2014 to see it officially cancelled.
Apparently, a playable version of this product has been leaked to the internet and some users have been able to run it in modified Xbox 360 systems. 6 levels have been showed in different footages. Here is the first level captured in the glory of 720p. Enjoy this work in progress:
Thanks, Delso Bezerra.