Because EA isn't a very modder friendly publisher, because it's not a major selling point as it is with say Bethesda, and because it never really took off I don't really see them putting out a full blown tool set like we saw with Origins.
Really the toolset is up in the air right now. No one has any idea really. The fact that they're not just making 1 version of the game, but two (different combat) shows that they still care deeply about the PC players so there's still hope.