North America and Europe can play together
Capcom Unity, the community site for the developer, has announced the official box art for Monster Hunter 4 Ultimate, which is set to release in western markets in 2015. You can see both the actual art and the spine font in the gallery below.
More importantly though, multiplayer between the North American and European versions is a go! Capcom confirms that this involves local and online play, which is great news for people who have friends in a different region.