You can tell that AMD has been sending around NAVI samples, as hey, how difficult can it be to not leak a result. Regardless, somebody did do just that and posted a Time Spy run, and the score did not dissapoint.

The guys of WCCFTech posted an entry from the 3DMark Time Spy database. The specific card scores 8575 points with a GPU score of 8719 and 7843 CPU points. That matches up with their results of the GeForce RTX 2070 Founders Edition with 8901 points. Vega 64 scored 7427 so the thesis is that the generic device will be the Radeon RX 5700 XT. The entry, which has been tested with a Core i7 8700K was removed from the database, which kind of confirms as well, it is a product under embargo.

3DMark Time Spy Result shows Radeon RX 5700 XT close to GeForce RTX 2070