Does anyone know if Capcom formed a contract with NT about multiple games, or was this a one off?
I'm not sure anyone knows for sure. Judging by the open ending in both the core game and then the DLC, I'd say NT was simply too confident and assumed they'd get a green light to continue. For now, that would probably be the safest assumption.
Don't forget that they were working under the expectation of selling 5 million units, yet they've barely reached 0.6 million sold. The safest assumption is that no one will be making a Devil May Cry for quite some time.
Do you miss the old Dante? Get to twitter and find @BringBackKamiya