The GDC clip is basically him talking on others people work completely unrelated to what he's supposed to sell. High five!
Two popular YouTubers, John “TotalBiscuit” Bain and Jim “Jim Sterling” Sterling, visited the offices of Valve to learn something about the future of Steam. It appears that Valve created a system of algorithms for differentiating good games from the bad ones.
This system has a risk of burying some good games too, so the company will introduce Steam Explorers. Explorers will play games with poor sales to see if there are some good ones and flag them. Anybody can be Explorer, just like with Steam Curators. Steam Curators system will be redesigned too. It will get embedded videos, top ten lists, different types of sorting and other features.
Regular Steam users will get more info on games. You will be able to find out why a particular game is being shown to you, how many impressions that page gets, where those impressions come from, and more.
The company is also sure that once Steam Direct launches, fewer games will be admitted and the quality will be higher.