Ok, now I'm really excited. From what you guys are saying, it sounds like this James Wan is great when it comes to writing/directing movies. Anyway, the "movie poster" looks awesome and regardless of whether it's real or not, just looking at it gets me excited.
Anyway, regarding the presence of the katana, there have been katanas in several CV games and SotN had several different types of them. I doubt that Alucard had ever been to Japan between CV3 and SotN.
Besides, the idea of a combination of grabing an enemy with the whip and killing it with the katana mentioned by one of you guys it a cool idea.
In conclusion, it seems that the movie could be good and even though I am an atheist, I am praying that this movie is awesome. Right now, all we can do is wait and see.