Garmin Colorado 300 GPS on the horizon?

We'll start by recommending a little dose of salt before taking this one in, but nevertheless, an interesting photo coupled with a "prototype hands-on report" has got us wondering if Garmin doesn't have a new GPS unit somewhere close to release. Apparently, the device you see above (labeled Colorado 300) relies primarily on the circular scroll wheel for navigating menus, and if we had to guess, it'll likely be marketed towards marine / outdoors customers. Aside from that, all we're told is that it should land sometime this Spring for around $500, but we're not holding our collective breath just yet.

[Via GPS Tracklog, thanks Rich]