Well, from what I know of the game, it seems to have been in development for a long time and delayed, which I don't take to be a good sign. Also, I'm not really interested in Wolfenstein - I am 26 and I've never played a wolfenstein game before, ever. Many people my age are in the same boat. Thirdly, the trailers they've put out have mostly been showcasing their alternate history thing, which is goofy (in a good way) and interesting but tells me nothing about the actual game play. Fourthly, MachineGames, the developer, has no other games under its belt. Yes, it has former Starbreeze employees, but that doesn't mean they work well as a team, or that the leadership is good enough to make a good game. So really, there's nothing to recommend this game to me. I'm not terribly interested in gunning down Nazis either.
I'm keeping an open mind - I'll wait for reviews, and if the reviews are good and I have enough spare time, I might pick it up. But as for why I'm not excited - I'm just not. I don't know how well the game is going to turn out. I'm not especially interested in the setting or the enemies. I've seen only snippets of gameplay, and I have no other game by the developer to judge as to the developer's competency. So you ask why I'm not interested, but in my mind the question is "Why should I be?"