According to PWInsider, Sami Zayn and Kevin Owens have both been sent home after last night's taping of SmackDown. Their report could not confirm a reason why, but did say both were sent back to the U.S.
According to a report by Sports Illustrated, Vince McMahon approved the decision to send them home after "going into business for themselves" during their on-air time on last night's SmackDown. It was said that they were sent home "for conduct deemed detrimental to the WWE." You can see their segment in the video above.
Both Zayn and Owens are involved in the Team Raw vs. Team SmackDown storyline as outcasts on the SmackDown roster, but at this point, neither are in a match at Survivor Series. In October, Kevin Owens had to leave the South American WWE tour, due to family issues that are apparently now resolved.