I've been thinking about what exotics I would love to see and the number one exotic I want to see is an exotic set, one for each class, that allows the user to use two exotic weapons at once, in essence sacrificing the exotic armor slot for an additional exotic weapon slot. The armor would have the defense of the legendary variant of that armor, and the perks would be fairly standard, Hunter may get melee kills charge super and more special ammo, Titans get melee reduce grenade cool down and more heavy ammo, etc.
The distribution of this exotic would be similar to the distribution of The keeper of the pack exotics alpha lupi and light beyond.