I wonder what the special casting is going to be for TAR22. I noticed that recently the even numbered seasons have all had either crossover teams or returning teams or something like that. TAR16 had Jeff & Jordan. TAR18 was Unfinished Buisness. TAR20 had Brendon & Rachel. So I'm excited to find out what we're going to have like that in TAR22 
Not to mention Ethan and Jenna from Survivor on Season 19.
Ryan (season 21) was also a former reality show competitor on the Martha Stewart Apprentice, but don't forget about the way past seasons like Rob & Amber from season 7 and all-stars.

They were incredible racers, but had bad attitudes. Alison from Big Brother 4 was forgettable. She participated with her ex-BF, Donny in season 5. I'm hoping for a CBS soap opera or A&E reality appearance couple this season.