NRANews’s Cam and Company [ iTunes Link, 1/14/10 episode ] let slip the news that Ruger would have a LCR chambered in .357 Magnum on display. I am sure that this is the wheel gun that Michael Bane recently blogged about!
The original .38 Special Ruger LCR was announced at SHOT Show last year.

Ruger Lightweight Compact Revolver (LCR) .38 Special
[ Many thanks to Nick for alerting me to the news. ]