Nice to see Conti finally getting in the game. Hard to keep up with Schwalbe though. Both are top notch.
I've been running the GP5000 as a slick gravel tire (although its not a very tough tire), and the G-One for something a little bigger with a little tread.
Those Conti's don't work well on rims that are at all oversized or hookless rims. They do talk about having an "official" road tubless standard within a year, and that would be a good thing. Those gravel tires meet the presumed standard (even if some of my wheels don't).