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Hardware acceleration of BVH traversal and tight integration with the shader cores to allow efficient scheduling of shader execution and new ray generation when ray hits are detected.

The former is discussed here: https://devblogs.nvidia.com/thinking-parallel-part-ii-tree-t...

That's a software implementation though. These new cards have actual hardware specifically for that.

While the 4800 series Radeon cards supported fully ray-traced pipelines it wasn't necessarily dedicated to it. These have a section of the chip entirely dedicated to ray-tracing computations and acceleration.

Their denoising looks interesting: https://www.youtube.com/watch?v=9yy18s-FHWw