In case anyone here is interested, there are two new Ruger calibers coming down the pipe.
They are short magnums based on the 375 Ruger case.
The first is the 338 RCM (Ruger Compact Magnum) and the second is the 300 RCM. Hornday has an image up on their site and there is a teaser article from Boddington in Guns and Ammo.
Both are supposed to fit in a short-action frame and new gun offerings are in the works from Ruger. Oddly enough, with the new Ruger marketing plan, we'll not hear much until the guns are ready to ship.