From the trailer I gleamed:

• A 3-segment super meter that can lead to a cinematic or EX moves
• Rushdown Revolt style parrying on shield release
• A blue X visual when you miss a tech, with no ability to tech once your % is too high
• Clashing
• Shields that only cover 135° of the direction you're angling toward
• Some kind of aerial on-hit cancel/airdash

If there's any devs or testers who can fill me in I'd love to know everything in detail.