Diesel option anytime soon for the 2007 Power Wagons?

This article below indicates it's possibly coming up. The truck option build choices at www.dodge.com for a 2006 only offer the Hemi, and the ability to build a 2007 is not available yet. Does anyone know of a time
frame for the Cummins?
http://www.allpar.com/model/ram/power-wagon.html
Thanks, Ace
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