There was material released saying it'd be a ten man.
From WWE.com, dated September 16:
WWE sources have confirmed that The Rock and John Cena will be a part of a Traditional 5-on-5 Survivor Series Tag Team Match.
Stay tuned for more details.
http://www.wwe.com/shows/survivorser...urvivor-series
---
It can still turn into a ten man, don't get me wrong, just saying that it's a possibility of it being dropped.