Samsung has yet to release a Galaxy Tab S-line tablet this year. Last year's model, the Tab S4, could be said to be a high-end example of this device category, as it had 4GB of RAM, a 1600x2560 SuperAMOLED screen and has been upgraded to Android 9 (Pie). On the other hand, it did also have a 10nm Snapdragon processor from the previous year (the 835).
A new rumor suggests that Samsung have amended this slight deficiency in the next upcoming Galaxy Tab S. According to a Geekbench listing dug up by MySmartPrice, the OEM is preparing a device called the SM-T865 with the newer, 7nm Snapdragon 855 SoC. As the Tab S4's LTE-enabled model had a model name of SM-T835, it is possible that the leaked device is its successor.
The 'SM-T865' was also found to run Android Pie and to have 6GB of RAM. Should this leak prove true, the putative device could be called the Tab S5 on launch. However, as the results in question are now absent from the Geekbench website, this is not completely likely.