The 812's will be produced in a 12.5 version. They didn't give a time frame but it is in the works.
I got to ride on a set of 412's (812's are fancy 412's) and I have to tell you, my next personal purchase is a set for my Blue! The ride is unmistakably better, you can even feel the difference in how it handles while riding straight down the road, feels more solid, absolutely great.
eddy