Someone at Epic… kiiinda… forgot to use the right repository and… well… I have access to the new Niagara Particle system editor right now!
Special thanks to ShadowRiver for knowing what to pull, and how to enable it!
So I am going to keep this short as I am going to record another video of me trying the editor out, but for now:
I ****ing hate April Fool’s Day. That being said, I’d actually really like that sort of interface for a particle editor as I really dislike the current UI we have now.
There’s already a video out showing the Niagara UI (for one second or so) and it didn’t look like that. 
it’s ParticleLab(Flint Particle System) 
yea, it was the only thing I could find that felt niagara-esque, without being… well… niagara.