Episode 6.15 will be called The French Mistake.
Ausiello: As you may or may not have heard, a late winter episode will obliterate the fourth wall by transporting Sam and Dean to an alt-uni where they are actors named Jensen Ackles and Jared Padalecki starring in a cult TV show called Supernatural. Wait, it gets wink-winkier: In this other dimension, Sam/Jared has a wife — and it’s none other than Padalecki’s real-life bride (and former ‘Supe costar) Genevieve Cortese!
Source: TVLine.com