Here is his interview (both video and transcript) with the PBS Newshour's Hari Sreenivasan. The concept is riveting. Salopek is no stranger to strenuous travel, having ridden a mule across Mexico, and run the Congo River in a canoe. He will be providing reports at regular intervals, with an emphasis on the human stories he encounters ~ especially stories which provide local solutions to larger problems.
This trek has a potential for drama and insight comparable to the 1947 trans-Pacific voyage of the Kon-Tiki, with the added benefit of contact with all the cultures along Salopek's route. I hope I'm still around when the trip is completed, and National Geographic produces a film of his journey.