I wrote a summary for those who prefer text that goes with it. Apologies if something is off somewhere, that's what I got from rewatching the PLL segments dedicated to it:

- You have a main dual single blades filler made of 2 buttons. Depending of the ones you use in which order things light up differently and give you 3 different buffs of 30s each to juggle with (a bit like SAM with its different combos, just more intertwined). Once you finish a sequence of 3 you get a continuation proc that uses the double blade. The different types of sequences don't need you to necessarily keep yourself glued to the 3 buffs, they're also indicated by the blades on the gauge, not sure exactly how so far but their colours change.
- You have a 40s recast GCD which uses the double blade: it leads to 2 buttons (left and right), and if you use the left button first, it gives you 2 continuation procs that use the single dual blades (1 proccing into 2). If you use the right button first, same but the continuation procs go the other way (2 into 1). Then you can proceed to the other side, so you can do left then right, or right then left. This also gives you a red gem on the gauge. 40s means you'll use 2 of those in the 120s bursts, and 1 in the odd minute burst.
- Faster GCD on the single dual blade filler than on the double blade.
- Red gems on the gauge (up to 3) are used for ranged attacks. A bit like for the double blade, you press it, then it goes into 2 continuation procs (just no left and right variants). A 120s ability also gives a free gem. This is more likely for mobility.
- There is 2 non damage gap closers.
- AoE skills are the exact mirror of the single target skills.
- At 50 vial gauge it turns from red to blue and you can use the enshroud-like fast paced burst, you get 5 blue little orbs to spend, just follow the procs that light up... doesnt seem very hard. The filler sequences and the double blade 40s recasts fill the gauge when completed. The 120s ability giving a free gem also gives you a free burst without gauge cost.
- I haven't seen party raid buffs but maybe there is.

Some more minor abilities in the job trailer werent on the hotbar and showcased I think.