PWMania.com reported earlier this week how WWE is planning on putting the Tag Team Titles on Rey Mysterio and Sin Cara so they can build to a WrestleMania 29 match between the two. In an update, there has been at least some talk of making Rey Mysterio the heel while Sin Cara works as the babyface. With that said, some believe it would be a very bad idea for Mysterio to turn heel.
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Personally neither should turn heel, and should remain both babyfaces and let the crowd choose who to support which will probably be Mysterio. Would feel weird seeing Mysterio a heel.