Looks like this leg ends in a TBC, taken from the tv guide for September 1:
With no rest period between legs, teams are still racing and heading for central Russia. After a long train trip they face a testing nation v nation challenge. Teams from the losing nation face the very real prospect of being eliminated. The last team to the mat surprises all, but will a twist at the pit stop save them from elimination?
Still haven't got any media info specifically for this leg whatsoever though