It would appear that Valve has stealthily updated the Steam storefront. What they have termed the Discovery 2.0 update brings a sleek new UI and a host of new features to help you figure out what game you want to play next.
The featured games at the top of the storefront now display their tags, a brief description, and 4 screenshots displayed next to the standard header image. Valve cracking down on misleading screenshots on game store pages makes a whole lot more sense now. Games that you already own will be filtered out of the new and bestselling lists, a feature that seems far more useful in actually using the Steam charts to find new games to play. You can also filter out movies, VR games, Early Access games, and any other tags you don't want to see cluttering up the page.
Right below the featured games is now a section for games on sale, below that you will see a section displaying your friend's recent activities, and then below that your discovery queue. My favorite addition to this update is the curator rehaul. Curator pages have been completely redesigned. You can check the TechRaptor curator page here to see for yourself. The curator recommendations on the front page have also been expanded, showing you the header for the game, which curator is recommending it and a quote of their full review. It will feed your curators' latest recommendations and reviews into your front page now.
The "Recently updated" section of the storefront can now be filtered to only show games that you own that have been updated recently. The regular new releases have been cordoned off onto their own page, which shows Valve actually taking an effort to have at least a modicum of quality control on the Steam page.
For more information and a detailed look at all the changes, check out this page.