I don't know if anyone else has said this yet... Battallions might not be back.
I know this footage of Theodra's gambit has people assuming battallions are back, it really does look like it. But here's the thing;
Where's the batallion in the UI? She has a 2-use gambit, and troops appear when she uses it, but unlike in three houses, there is nothing in her unit summary or the description of the gambit itself to identify which batallion she is equipped with.
Dietrich (oh my god in english words his name is diet rich, that's so funny if he's like a disgraced or former noble) is the only one of the "lords" we see with a hero's relic, called by name, though Thodora's armor looks pretty hero's relic-like, so this might age badly.
Leda is the only "lord" shown to have a "manage gage" option, albiet greyed out, and considering this gage seems to go up as you use blaze arts and has the same symbol as the game's curse stat, alongise the hapi paralells and summoning demonic beasts and using dark magic, this seems to be an entire mechanic all it's own the others don't have...
Cai also has some power, though we don't quite get to see it in the game's mechanics. This, to me, suggests each "lord", if that's even what is going on here, has thier own mechanic all thier own, taking a more Fates-like approach where different paths (if that's even happening again?) offer different mechanics and playstyles. Thee houses teased this potential but it fell flat, with the various routes feeling extremly similar, some borderline identical to each other. and, for my wildest notion...
SUPEr unlikely but throwing shit against the wall here. What if dismounting across the board isn't back... what if only CAI can dismount? unlikely but there's so much we don't know I have to call it out now so if later it turns out the case I can point to this post and say I called it.