Okay, so the next episode appears to be the alien challenge, then a challenge about doing film crew stuff, then the surfboard/beach one. After that there would be 11 contestants left. On the trailer, you can see 11 contestants somewhere within the western challenge, which must be after the beach. The 11 that appear somewhere in the western challenge:
Trent, Justin, Beth, Lindsay, Owen, Gwen, Duncan, DJ, Leshawna, Heather, and Harold.
This means that Geoff, Bridgette, and Izzy are the first 3 voted off. Of course the order of those 3 is unknown right now.
It also appears the one team is Gwen, Duncan, DJ, Leshawna, Heather, and Harold. The other one is Trent, Justin, Owen, Beth, and Lindsay. This means that 2 out of the first 3 voted out are on Trent's team and 1 is on Gwen's team.
Just my input.