Imo they NEED to do Prelude to Chaos 2.0 with a Phantom, Sheriff, Guardian and Spectre
Idea #1: Elderflame
First bundle was dragons; would be cool if the second bundle was wyverns. Kind of like Prime//2.0 where it's the same idea with a different focal point and different variants. I'm imagining a Ghost, Guardian, Phantom, Outlaw, and a thin sword, Artisan Foil style, with a slash for a right click. The 2.0 would also feature variants for the melee, as well as the buddy, kill banner, and finisher.
Idea #2: Singularity
The futuristic, angular design of Singularity is one I feel would fit really well on a lot of different skins. I'd love to see them clean up the edges, make it more geometric, and give variants to the melee, buddy, kill banner, and finisher. I'm picturing a Frenzy, Stinger, Guardian, Vandal, and some kind of a dual wield.
I'm hella down for a RES2. If they can make it work on the heaviest weapon in the game (op) they can make it work on most other guns. I'm hoping for a Classic, Spectre, Vandal, Odin, and... this might be overcooking, but imagine a blade with RGX animations, where instead of pulling out a blade you're turning on a sort of lightsaber or plasma sword, each one matching each of the variants.