DMC3 Dante called the Ice Cerberus ''Fido'', if I remember correctly, and treated him like a domestic dog. It wasn't just casual confidence, it was pure cockiness.
This is a younger and different Dante. Fans complained in the beginning, me included, about Dante feeling too gothic and serious. Now we have a confident Dante that goes where he needs to go and with a smile on his face. The ''**** you'' is the sign of his self-confidence.
While they are different Dante's, they're starting to feel alike. This character could easily become the Dante we know, someday. That is, if it was set in the same continuity.
Something else I liked were the comments I read in many sites. The bitterness towards this game was huge before. But, after recent trailers showing his personality and the gameplay, that has changed drastically. I see a lot of people supporting and eagerly anticipating the game. With reason, since it seems Ninja Theory heard the complaints and agreed that they had some fundament.