The new weapons seem interesting with quite a bit of interesting fluff. Where they really win compared to the rest of Gun
Haven Heaven is in artwork. As in, they look like actual firearms rather than Airsoft repaints or, um, whatever the other firearms are supposed to be (Can we have the artist pop on the board to talk about this, please, if we're polite?). Oh, and a sword. That shoots.
You can tell the lineage of the firearms in question if you look at them and know firearms history (One is obviously based off the Tokarev TT-30.). The sword looks decent, and the one firearm that looks like an original design appears like something that I'd find in my copy of Jane's (The closest a Canuck like myself can get to a gun store.).
There's two machine pistols, two assault rifles (With a lot of bells and whistles), a grenade launcher, a sporting rifle (That looks like a sporting rifle! Honestly, I want one!), a SMG, and the aforementioned sword (Basically a REALLY BIG
Ballistic Knife.). More calibers are mentioned in the fluff, which I like, but will just cause more confusion down the line in some other ways as well...
As for what makes them stand out? Fluff, style, look... It's all about appearance, man! Some folks love how the Beretta M9 looks, while I prefer the hard edges of a M1911, and some folks are Revolver freaks.