With the caveat that I have absolutely no special knowledge of the project other than to have placed a letter on file seeking to reserve one, I would make a wild guess that the R45 will be based on the successful R9 DAO design but be more "robust" overall, retain the heel-type magazine release, have 6 plus 1 capacity, be about 25% larger in dimension than the R9, and weigh in at about 22 ounces empty.
My crystal ball just fogged up on me.