Does anyone know if ruger will be putting out a gun in the 460?
I'd highly doubt it.
First, they'd need an entirely new platform as it's too long for any of thier current platforms. That's some considerable design & engineering.
Secondly, for what small of a market it would have, Ruger would be sacrificing too large of an amount of it's other production models that remain popular sellers. They have a difficult time now keeping many of thier models sufficiently available. Adding an entirely new platform wouldn't make that any better.