There are 6 episodes left in season three, but Nikita is not yet renewed for season four. Ratings were a little bit down, but it's getting better.
We want season four! We don't want Nikita to be cancelled.
According to deadline there are talks that it could be renewed for a final, shortened (containing 13 episodes) fourth season. I think that we need at least those 13 episodes (if they can't make 22 episodes) and we will fight for it!