Valve are always tweaking something on Steam and their latest experiment is an upgrade to the Store Hubs, the areas on Steam where you can browse through all the random tags.
Now, when you click a tag on Steam (if you opt-in), there's a great big banner carousel at the top to go through some of the featured games. This shows off those titles that are new, top-sellers, discounted, recommendations from users and curators and more from their mighty algorithm. Below that you will get a list of recent and upcoming events, helping you to stay on top of everything.
The massive banners at the top do waste a bit of space IMO but they certainly do grab your attention - so I guess they're working as intended. They also, again, don't seem to respect your operating system preferences as it just shows anything.
When you scroll further down, Valve also shows off various personalised recommendations based on what you've been playing, plus items from your wishlist that might be relevant. On top of that, there's also all their new sorting and filtering options available in a list towards the bottom (which does have a platform filter).
Overall, it's far more useful that what Valve had before for tag hubs, it's looking pretty good.