WWE had planned for Sasha Banks vs. Natalya for the Survivor Series pre-show on Sunday. They never advertised the match and they didn't do anything on TV to lead anyone to think that they were headed in that direction but that was the plan for the pre-show.
Dave Meltzer notes that, unless there is a last minute change, the match is off. As of this writing, WWE has not announced what match will take place on the pre-show. Also, we still don't know who will be involved on the 5-on-5 elimination match at the pay-per-view.