Hi rta, it really depends how much of an enthusiast you are and whether you want some decent weapons right at the beginning of the game. Those weapons will unlock later in the game anyway, it just gives you a slight advantage early on. as for the rest of the Deluxe package. The Beat access is no longer valid for obvious reasons and unless you are an enthusiastic Team fortress player and enjoy swapping your player skins in Killing floor the deluxe edition is a waste of money. Personally I'd have paid the extra £1.25 for the weapons, but then I love these games, but am not very good, so the advantage of havig better weapons helps.
Still, the deal price is something not to be missed. I throughly enjoyed playing this game and will be playing it a lot more once i've got my RPG bug sated. :) Definitely not a ghame to be missed if you like shooters even just a little. Watch the Steam videos, you'll see how good this game is, both game play and graphically. There's a couple of videos to see, plus if you go over to you tube you can see just about evey part of the game.
As for offering the Deluxe version now I suppose for some players, especially with 75% off the extras are worth getting, especially bearing in mind what I said above about those who like Killing Floor and Team Fortress as well.