there will be be giant mechanic orcs with laser cannons and you can enter them through their anus (incl. Enter/leaving animations).
Seriously, what do you expect?
The game has been developed by a small dev team, a former mod team (like tripwire).
This game is based on the arma2 engine and of course the gameplay, interface, etc. Will be similar to arma2 (they don't have the budget to start from 0 and develop a complete new game).
Nevertheless this game differs from arma2, the devs have not just added wwii models, they have also implented new features and enhanced the gameplay, so this is to arma2 like arma2 oa was to arma2. A new scenario and a bunch of new features, but not a complete new game.
It's definitely more than a mod (or at least an awesome mod), but not a completely different game. It's like a standalone add-on.
It's your choice whether you want to spend 20, 30, 40 or 70 bucks on it, but the target group of this game are arma players anyway and if someone doesn't like arma because of it's gameplay or its "flaws", then he'll probably dislike iron front, too.
I don't care, i'm playing the beta and i'm really enojoying it and they already got my money ...