Some information gathered from these videos:
The mysterious Effy is localised as Faye, while Kamui, Leon, Valbar, Lukas, Mae, Genny and Boey are all confirmed for their English names. Also Grieth by way of some brigands being members of the "Grieth's Army" faction. Kamui also has a mysterious icon next to his name, very curious. Other localisations include Alm's class staying as Fighter, Celica's Angel spell as Seraphim, Illusion is called Invoke, and what appears to be a Sorcerer is now called an Arcanist, using a Miasma spell. Also "Food" is now "Provisions" and only Celica can access it of her party - though everyone else can access their "equipped" Food via the Items option, I'd wager, since Items only appeared in those that had it - along with the Convoy. Since we first saw the "Food" option from Alm, obviously our main lords are hoarding all the good stuff.
Support Stuff: We see Valbar has one with Kamui, and Celica and Mae, while they don't have one yet, appear to be growing one, with Awakening/Fates-style glowing animations (same sound cue) appearing after they each engages in combat in range of the other. Curiously, Valbar and Kamui do not have the same thing appear despite having the support already; does this indicate that they're at a top level support? Or maybe you have to assign who to build supports with, like Radiant Dawn but not every character with every character, but after you're done building a level you can switch to someone else to build with while still maintaining the support bonus... No complaints either way.
In my last speculation post I'd figured that the six little squares underneath the Terrain Bonus number meant it would either be a variable gauge, or just a visual guide with the number of squares being filled as corresponds with the Avoid bonus - tada, it's the latter, as Forest has a 40 Avoid and four squares filled.
Weapons/Accessories: Saber's got a Golden Dagger (+1 ATK), Alm an Iron Sword (+2 ATK), Genny a Leather Shield (+3 DEF), Kamui a Steel Sword (+4 ATK, -1 SPD) and Lukas and Iron Lance (+2 ATK). Food items: Holey Cheese, Drinking Water, Hard Bread, Dried Meat, Bread and Orange. Appears that enemies can drop silver or gold, the former of which is used in the forging of weapons. So, y'know, forging confirmed.
The Little Things: Alm's sword glinting at the start of the battle was fun. Fully voiced dialogue finally hit me what with Alm's little monologue and Mae's level up text (Side note: Mae. Goddamn amazing all over.). Dungeons appear to have lots of stuff to smash, and Alm can even dash into them. Dat Mila's Divine Protection remix. The amount of question marks in unlearned skills/attributes is varied; some long ??????? while Genny had a ???? and Kamui a ?????; also since they don't show up in any character not with an equipped weapon/accessory, they're linked to the weapon/accessory's growth. Intriguing thing called a "Turnwheel" appearing in the menu sandwiched between the usual "Units" and "Tactics". Three-ranged archery has a little zoom in effect as the arrow hits. Again, Mae. Everything.
So damn hyped.