Fallout Tactics 2 is a cancelled action RPG developed by Micro Forté in 2001, that was meant to be the sequel to Fallout Tactics: Brotherhood of Steel. Pre-production started shortly before the release of the first game, but FT2 was soon canned by Interplay when Fallout Tactics started selling rather poorly.
As we can read in an interview with Gareth Davies (that worked as junior artist and additional design for the project) on No Mutants Allowed:
I’m also pretty disappointed that Tactics 2 never saw the light of day, since it’s a title that would have benefited from the experience and criticisms of the first game. Plus we were very conscious of heeding Fallout canon as best we could, and providing more interesting tactical missions rather than the run and gun focus of the first game.
You can read more info on Fallout Wikia! Sadly only few concept arts remain from this project.