Summary from Zoonam
*Lore wise they are basically alternate versions of "What ifs" .
*7* Units will be able to Dream Evolve only after reaching their max level.
*To Evolve, they'll need 10 materials, including Nymphs and Spirits
*Elgif carry over to next evolution, SBB halved as usual.
*In addition to Zel, Karma will also be needed
*Both Leader Skill and BB will be more powerful.
*At first only the Six Heroes will Dream Evolve.
*When a Unit get to level 150, with SBB 10 (UBB unlocked), it will be possible to obtain Special Abilities
*If a 7* Unit had its UBB unlocked, the SBB level will go back to 1
*30% to all stats when the Six Heroes have their spheres equipped
*At first you'll have 10 SP, but you will be able to obtain more (like when you level a BB)
*SP longform is Specialty Point.
*100 SP max per unit, can be gained via fusing same unit, using burst frog / burst emperor, sphere frog, etc. Customization such as HP up, spark (either spark dmg up or, spark crit, or whatever), crit (crit damage up, crit chance, etc. IDK the full details yet.)
*SPs are necessary to obtain Special Abilities
*Special Abilities are various, and different from Unit to Unit. Costs of Special Abilities vary.
Some cost between 10-20 SP, some cost as much as 80 SP. You will not be able to select all Special Abilities for one unit because of this.
*Once a unit Special Abilities are unlocked (read, once you've distributed every SP) you'll be able to reset them for 3 Gems
*When a Dream Unit Sparks with another Dream Unit (T/N: possibly of the same element, given the interview details), a Cross Spark will occur -> this will lead (invoke is the term used) to the Resonance Effect
*While Resonating, the party members of the same Element of the Dream Unit will get buffed
*With more Units of the same Element in the party, the Resonance Effect will be stronger