I'm not tremendous at vidcaps, but for those of you who watch China Rush on ICS online, there is usually a China Rush commercial during the China Rush breaks (that's an odd advertising principle?) that highlights some of the upcoming challenges/teams.
If we assume that we know most of the major challenges in next week's HuangShan leg (waterfall climbing, counting characters (?)) from the end of leg preview, it's pretty safe to say that the following teams survive next week's episode:
Karen and Janelle
Ryan and Charlie
Khai Shing and Khai Sheng
Christine and Steven (which we already know thanks to the Taiwan spoiler)