You can read Ueli's full write up of his Cho Oyu ascent here: Himalaya Speed Blog
His main objective for the trip is to also climb Everest this season, giving him three 8000m peaks in a very short time. You can keep up with his progress on his website: Himalaya Speed.
Here are a couple of videos from his Himalaya trip so far:
VIDEO: Ueli Steck Speed Himalaya 1
VIDEO: Ueli Steck Speed Himalaya 2