Nvidia patent of traversal shader-ish implementation?
The RayOp seems not a new shader programming model but simple parameter based operation performed inside of RT core to control traversal steps as far as I understand.
Query-specific behavioral modification of tree traversal (freepatentsonline.com)
Flexible Ray Traversal with an Extended Programming Model (yonsei.ac.kr)
Thus, example embodiments provide means for an application
to fine-tune TTU-accelerated traversal for purposes
such as, but not limited to, limiting traversal to a portion of
the acceleration data structure or to allow software running
on the SM to interrupt traversal to override or augment
specific nodes or classes of nodes in the acceleration data
structure.
In order to facilitate the query-specific dynamic and
programmable change of the traversal process noted above,
example embodiments provide a per-ray set of ray operations
( each ray operation is referred to as a "RayOp"),
associated ray parameters, ray flags and mode flags, based
upon which the behavior of the TTU traversal can be
changed on a per-ray and/or per-intersection basis.
Page 32 and 33 get into it quite nicely without all the examples.