I'd like them to include a futuristic version of every gun.
If you think about it the weapons are gonna have to be really advanced with amazing automatic aiming. The military ought to have some serious weaponry by now and bullets that fly towards the enemy.
There could also be a futuristic bow and arrow where the bow can fly itself. And vehicles will float people will have Vegeta glasses.
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It all depends on what kind of game Destiny will be. If it will be like Borderlands, I'd like a random gun system like it, and maybe the ability to craft certain buffs/parts that affect the appearance and performance of the weapon.