The K-5 fits the Epic 100... one advantage of Pentax DSLRs being a tad smaller and lighter than the Canikons, you can use the Epic 100 which is currently less than half the price of the $995 Epic Pro (though of course the Pro does have extra features that do justify its higher price, the main ones being smaller FOV increments and being able to lift heavier lenses.) The Gigapan hardware business was sold a while back to Omegabrandess, while the free hosting service is still maintained by Carnegie Mellon.
With cameras getting lighter yet more powerful, and still increasing their pixel counts, Gigapan panoramic photography is still breaking new ground... especially if you consider the resolution increase Pentax's Super Resolution offers (on static subjects).
Here are a few gigapans I shot with the K5 using the cable trigger rather than the button push option; the cable option gives quicker, more consistent results anyhow (you might notice the first couple have been tweaked in Photomatix)
Salinas de Maras Huaca de la Luna Arica