(No, there are no pictures or any more teasers, unless someone from RG chimes in).
In any event we don’t have long to wait; it should be launched in the next few months.
I think collectively the entire C lineup once complete will have something for everyone in terms of case and dial variants.
I also don’t agree with C2 and C4. I’ve owned “coated” watches for more than a decade and a half and no issues. That said, I acknowledge if someone is really hard on their watches then potentially it’s an issue.