Since we know Sera plays Cubic too, Konami can split the Cubic cards between the two of them. Give most of the monsters to Aigami, and most of the backrow cards to Sera.
Sera duels in the manga (although it was not a standard kind of duel). That's how we know she plays Cubic too, as "Duza the Meteor Cubic Vessel" is her card.
That and we have Tristan and Mokuba. Her lack of duels isn't an issue anymore at this point.
Some datamine says that before Arc-v we're gonna get darkdimension world, so you have to wait like 2 years.
Since the datamine said this year is that DM filler arc instead of zexal.
Even though they did announce it, you should be aware how long ago it was. It's cool and all to hear about Sera and Aigami, but as you can see, Sera only gets to play the Constellars. Therefore the only cards with the Cubic theme are Duza the Cubic Meteor Vessel and Cubic Mandala and they can't be used properly yet. And if you think about it, the Cubic Archetype might be very broken in competitive