So IKevinX was able to get a quick interview with Senior Producer Okabe and based on what he claims Okabe says.
-The weapons Dante gets in the game are represented by bosses (meaning each new weapon comes with a boss fight) but the way it is worded it may not involve every weapon so Cavaliere already has a boss fight with it and Balrog, Cerberus, and Faust could be potential bosses in the game.
-They never showed off all the weapons at NYCC. This could mostly mean Dante and not Dante and Nero but once again it would be very disappointing if they just mean V. But then again they said nearly all so they're probably referring to Dante (he probably has 1 gun and 1 DA left or something).
From what I remember we start out with Balrog equipped, so we have 2 Melee Weapons and 2 Guns right from the get go with Dante.
I personally hope to be able to fill 2 different Loadouts, wich is wishful thinking I know since that would mean 8 Melee Weapons and 8 Guns.