So Season 4 is premiering on June 28. Which is a bit earlier than previous seasons (Probably due to the Summer Olympics effect).
Season 3 premiered on July 08, 2015, with teams bios officially posted on June 19, 2015.
Considering this, can we assume they'll be doing the same next week, for Season 4 cast.
Also, Trying to remember if they did also reveal most or part of the route around that time, so we can maybe figure out the legs we are missing.