Actually all the voices are in English. The instruction booklet and in-game menus are Japanese, but I haven't heard one Japanese voice in the game. It's kind of weird. It's mostly localized but there isn't even a release date yet for the west.
And it's definitely an RPG. The story is variable and you can choose sides in a massive demon war. You learn magic and gradually improve your stats and skills based on which of the ten classes you start with. I can't remember all of them, but there is Barbarian, Knight, Soldier, Magician, Thief, Nobleman, Hunter, and a few others. They are really well differentiated too. It took me forever to decide who to start with because they all have distinct advantages and weaknesses. I went with knight because you start off fairly durable and I wanted to be able to shrug off a few blows while I warmed up. I just started a second game on another save slot as a Noblemen because they're a good mix of speed and light magic.
I think I'm getting used to the difficulty too. The sword-fighting takes some getting used to if you've played too much Ninja Gaiden and Devil May Cry. You'll run out of stamina and get owned very quickly if you just spam the attack button. You have to block, parry, dodge, roll, look for openings and try to catch the enemy off balance. Basically you have to be a little patient. Sometimes you need to buck with your shield, and other times it's better to go two-handed with a sword, or sneak around and catch them with a crossbow. You have to try all kinds of shit to beat bosses. You can toss fire fire canisters or light your sword a blaze, use magic, or try spears or clubs. The character's sense of gravity and environmental physics generally are really nice. I can't believe I compared WKC to The Lord of the Rings. THIS game actually reminds of some of the massive monster fights from those movies. I'm really digging it.