Seems like a very niche bike for a specific audience, kinda like a dual suspension fatbike. Not really for me but I can see a few dirty kanza type riders choosing it.
Niner's CVA suspension stiffens up pretty good when putting the power down, at least on their mountain bikes it does, so I wonder how plush right off the top of the suspension stroke this version will be. I would think it needs to be dialed to be really plush within the initial hits which is a bit different compared to something like their Jet9.
btw, Niner's Air9 is one of my favorite hardtails, and I have an older Jet9 hanging in the garage. The company always made fine bikes so if they really tackle the full suspension gravel thing I think they will make a pretty cool bike.