Besides the Deep Learning Super Sampling and ray tracing tech that might not be implemented in games right away, the RTX 2000-series GPUs also integrate a series of features that could theoretically bring 50% performance gains over the Pascal chips. Videocardz made a brief summary of all these features, which should be explained in detail after the review embargo lift from tomorrow.
https://www.notebookcheck.net/New-Nvidia-Turing-key-features-detailed-ahead-of-review-embargo-lift.331414.0.html
I'll be waiting for the next Razer 15 with a RTX2070 Max Q or something.