Documentation would be nice.Not to doubt you at all, but spoiling history is full of cases where people dropped in saying they have a source but nothing to back it up and it turns out to be incorrect. That's not to say that Kevin and Drew aren't going -- based on their performance last week, I'd say they're the overwhelming choice to be Philiminated this coming episode anyway so it's not a reach to predict this.
A Tribe siggie
"Tsk, tsk. Pepe's messing with the newbies again." Spidey, 3/30/05
This is the expected time line on wikipedia.Don't know how accurate it is.
http://en.wikipedia.org/wiki/The_Amazing_Race_12
Applications were due on January 16, 2007. Semi-finalist interviews will be held sometime in February or March of 2007. Final casting interviews will take place in April 2007. Filming will take place sometime between June to August of 2007.