I am a 348 warlock voidwalker. I currently have the following two items equipped for the perks they offer;
Gauntlets=Nothing manacles
- enables scatter grenade tracking. Gain an additional scatter grenade charge. 
Artifact= Memory of Felwinter
- lose your super but gain one extra grenade/Melee charge and small boost to stats. Orbs grants melee/grenade energy. 
My case is that, there should be three scatter/grenades. One initial grenade, one from the gauntlets, and one from the artifact because losing a SUPER is much more significant than using two or three grenades. Especially giving the circumstances of a grenade versus a super! Think about it... 
A_phenom35 add me on Destiny PS4
						
					
					
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	They told use they wouldn't stack before they were released.