I think it will be fine.
And here's why I think so;
When first announced, Capcom wanted the fans to get all angry at it and shout about it all over the internet world. People will wonder what all the yelling is about and go to see the fireworks. So DmC was the talk of the video game world in reboot terms. Fans made all this stuff to hate new Dante and say he's not cool at all. This was making DmC shine in the sense that it created such a huge controversy, and it was also, strangely, picking up supporters of the game as well.
As the years passed, a gameplay trailer (E3 2011) was released which made a lot of fans reconsider things. But Capcom needed more angry fanboy juice so Tameen came it with his rant on how Dante wasn't cool anymore, creating more fireworks and more attention to the gaming world. as more trailers, and gameplay came, many people began to change their minds and some game reviewers gave it good reviews from the demo. Hell because of the fanboy hate it won video game awards from different events and got a lot of attention compared to the past DMC games.
When the television commercials come on, I bet the sales for it will increase from the fact that some gamers like violence like DmC is packing.
So we got supporters, regular gamers, and skeptics. I'd say it will sell alright. Whether it sells more then DMC4 is yet to be determined.