What Happened to 5K Displays?

Well CES 2019 came and went, and AFAICT we’ve seen zero announcements of any new ‘true’ 5K3K displays to add to the very few that exist. Only these 1440/2160-height widescreen displays, instead of true 2880-height 16:9 models.

This is strange, given Apple said at the October iPad event that the new (10Gbps) USB-C iPad Pros can connect with ‘up to’ 5K displays. Exact time:
https://www.youtube.com/watch?v=bfHEnw6Rm-4&t=3331s

However, zero non-Thunderbolt 3 5K3K displays actually exist?

Is it even possible to run true 5120x2880 5K displays (obviously in pixel-doubled mode: 2560x1440) at either 30 or 60Hz over a maximum 10Gbps USB-C connection? It seems a strange claim to make if no displays exist, and especially given the LG 5K’s rely on dual-DP 1.2 channels over a single TB3 connection in order to work on TB3 Macs? (I have two of them on my 2016 maxed-out 15MBP, which generally work really well.)

Weird and annoying, for sure.