How DevKitPro works with the Wii U ?

[RetroAndDev]

Hello,
Today I had some ideas to improve my tool to rebuild Wii U Dev Units Apps to Retail Wii U (Wii U Cafe SDK Deluxe - see here)
And I wanted to add support of DevKitPro however I can't test by myseft and I don't have very basic and theory knowledge in C or C++. And I want to know how DevKitPro make Wii U Games/Apps.

I want to know what type of build DKP produce (WUP, Raw or Install Images ?) and if they are made for Dev Units and with the common key (for Retail Units and E-Shop/Physical publishing)

Thanks !