No gsync one and there won't be any texture pack's for that resolution for probably another half a decade. 4K is where it will be at for the next 6-8 years it seems.
Though I do look forward to trying get a 8K panel in the future. One of the draws once a gsync 8k monitor is out will be not needing to use aa which some games still need at 4k.
It's just a shame there aren't more 4K G-Sync panels, especially at 32" which is a far more optimal size for 4K. There has been only one such monitor, the XB321HK, in the past few years, which I have always been a bit puzzled by. This looks to be changing at last in 2019, with a few larger 4K G-Sync models due to be released, although the pricing is no doubt going to be insane (but what isn't these days!?)