LG just announced the 34WK95U ultrawide monitor with 5120×2880 resolution and HDR capability with DisplayHDR 600 certification. It also sports a Thunderbolt 3 connection.
While not a Better Than 60Hz™ monitor, it is unusually noteworthy for a 60Hz monitor in combining 5K, HDR, and ultrawide into one big 34″ monitor.
There is also a non-ultrawide 4K version, the 32 inch 32UK950, with “eNano IPS” backlighting (similar to QLED) and 98% P3 color gamut.
LG also mentions that they are bringing out a 1440p G-SYNC monitor during CES 2018.