Meh... It's mostly extra RTX performance. RTX is the new PhysX, except where NVidia bought the patent on PhysX, now RTX is just an API on top of the Vulkan library path tracing end points. Sure they patented the api name, as NVidia is inevitably wont to do... And made it proprietary, as they are wont to do... And they probably did some optimisation and dedicated hardware support for their RTX api, as they are wont to do... And they are likely pushing their api among game developers, as they are wont to do... But it's just Vulkan in the end. Sadly of course the way they've done it many games will support RTX, but not the very Vulkan path tracing methods it is built on.
You can skip the bits about RTX, apart from knowing it will perform a bit better on the new card, and get the real news. Also of course the +-15 minute flashback. And the 10 minute or so speech by that other guy.