Sony also recently demonstrated this.
I would anticipate this to show up in the next generation of high-end Sony and Leica cameras, as well as those made by anyone else with the technology.
For the A9ii, it would be the logical next step, completely eliminating 'banding' issues with the electronic shutter and any movement-related readout distortions (e.g. golf clubs and helicopter blades), cementing it as a premier action camera. For the A7r4/A9r, it would also be useful, although not critical, in its role as a studio/'outdoor studio' camera, since it would completely eliminate flash sync speed as a limitation and allow even speedlights to easily overpower the sun (much easier with a 1/2000 exposure than a 1/200 exposure).
And, if the A9ii has it, everyone else will also add it in short order, if only to compete (although Leica largely exists in its own space, sustained as much by legacy and name as by actual performance).