It's a little less ambitious than the Librem 5 from the looks of it, but they're using a similar chipset (the older chip, basically), and the same type of GPU, and Librem is supporting Plasma Mobile as well. Since upstreaming is pretty important to the Librem team, it looks like there's the possibility for a lot of shared work between this and that.
It's exciting to think we might actually have an ecosystem of actually-Linux phones on the horizon. I just wish there was a release date, price, etc.