nVidia was never the best at coin mining if I remember correctly, AMD cards have more (simpler) compute units. These newer cards (2080ti) are faster and have more compute units so I assume they do mining better then previous cards like the 1080ti.
And if I understand correctly it's still to hard to do real-time (on resolutions like Full-HD+). The only ray-tracing done is to calculate some specific lighting in games (that's real-time) but not everything like you would see in a movie.
What I got from the presentation is that there are 3 parts to this new card: the regular part but more/faster/etc, the dedicated ray-tracing part and the AI part (which I assume are just simple compute units, but you get a bunch).
The new parts aren't used by games by default, so you wouldn't see any speed/feature increase from that. If the ray-tracing is used for some lighting and the AI part is used for anti-aliasing you have more computing power left in the 'regular' part, boosting your performance with the added value of nicer lighting and faster/arguably-better anti-aliasing.
You can see some part of the ray-tracing in the nvidia demo: