The real test here is whether they view the Cummins Diesel as a strategic advantage in terms of product, cost and engineering. There seems to be no question that the Duramax is a strong diesel engine, going neck to neck with our 6.7 in performance.
I was part of the Cummins organization manufacturing piston rings for 7 years at the Cummins Piston Ring Division, purchased from Koppers Piston Ring around 1985.
Kopper's process for developing ring shape (correct pressure distribution when closed) was thought to make piston rings strategic components. Later determined a commodity, the plant was sold... So, you can bet, they will be testing the waters from day one.

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7.5 3500QC 6.7CTD 68RFE Build date June 2007
Superchips tuner 3808, Boost/EGT Laser Gauge, Airaid cold intake