17hmr and even 22mag I could see. Would be cool if they did 17WSM too, not a lot of people chambering that.
Im not so sure about centerfire though? That would require more significant changes to the action, and who knows what sort of pressure these are being built to withstand? 22 and 17 hornet would be cool though! Not a lot of single shot options for those guys, other than T/C Encores etc and those cost far more than this is expected to run. That said, I'm not sure there is a lot of market demand for either of those cartridges? Us gunnutz would love 'em, but we are only a small part of the gun-buying public.