English movelist for all of the beta characters. From this we can infer:
The game has five buttons (there might be a sixth button that simply isn't listed on here, but five for sure). A & B (presumably light/medium normals), S (Skill? Basically a dedicated button for command normals or basic special moves), MS (Mana Skill(?) Button for special moves, you can do them with basic directional inputs or traditional motion inputs. They cost mana to perform) and finally AS (Awakening Skill, basically one-button super. You need to be in the "Awakened" state to use this).
2S is universal launcher/uppercut. We don't know what it actually does yet but every character's default launcher skill from DFO is mapped to 2S in this game except for Ranger. In DFO, these moves universally are armored and act as reversals.
Characters have Mana/MP (in the Health video above, its the horizontal blue bar underneath HP). You spend it to perform MS attacks. MP regenerates automatically as long as you haven't used an MS attack in the last few seconds.
Every character has a unique passive skill, which is something like "reduced chip damage taken" or "recover MP faster".
There is a guard gauge (the vertical light blue bar next to the timer on the HUD).