So a map editor would be satisfactory for a game like TFU? High ambitions there. I don't know, an action game like this just needs more modding capability than a basic map editor, and what would you do with it? MP would be cool, but I don't think it's in. Create new SP levels? Well, there's one positive about this whole thing, if they pulled it off.
Of course my described scenario won't be a factor whether tools actually do get released or not, I was just curious which games under similar circumstances actually did receive tools/support for modding.