I know we will have *at least* 12 on some maps. I forget which character video it was, but I believe it was Anna's where we had 12 units deployed
Anyways, no plans on which emblem goes to who, but I will be employing every mage we get our hands on, along with Alear, Anna, Etie, and Rosado. So at the very least, my core team will comprise of Alear, Anna, Rosado, Etie, Clanne, Ivy, Hortensia, Citrine (has been shown off spellcasting in Eirika's video) and Celine