Tidbits from the website that have gone unnoticed...
http://www.nintendo.co.jp/wiiu/asej/world/index.htmlNew high quality GIF of character conversation emotes and walkin' around the city. Blink and you'll miss it but you can see an un-silhouetted guy in a suit standing next to a terminal, my instinct says save point but we have already seen you can save anywhere. Also there are posters of the Tsubasa on the buildings, so this must be after her musical debut.
http://www.nintendo.co.jp/wiiu/asej/world/mirage.htmlAnother GIF showing off some super slick battle animations. Looks as though the fire emblem mirages are sealed inside the weapons, like Fi basically.
Image of Itsuki and Chrom in front of the shrine together.
http://www.nintendo.co.jp/wiiu/asej/world/stage.htmlNot much to note here but you get a look at the cutscenes without the youtube compression.
http://www.nintendo.co.jp/wiiu/asej/character/itsuki.htmlNever before seen character artwork for Itsuki.
https://pbs.twimg.com/media/CHrm0VvVEAAFPyF.jpgNew character artwork for Tiki.
https://www.youtube.com/watch?v=KdrPI7R7kXA1:45 Silhouettes of more unannounced Fire Emblem characters.
1:49 Unidentified Fire Emblem character, looks suspiciously like Abel.
1:52 For a few frames you can see Tiki performing a ritual in front of the shrine, followed by some more characters doing "Hey look at me" animations, looks like promotions or something like that.
https://youtu.be/gKaHMqkjGS8?t=58s0:58 Two unidentified Fire Emblem characters, a swordsman with red hair and black armour, and another with a lance and cream armour.
https://www.youtube.com/watch?v=ZRcGHIp8KvYItsuki has a rapier in the first save file and a lance in the second.
Last one, at 35:22 there is a place called "Crepes Dia" which is a persona reference.
Noticed something else, there is a remix of the Fire Emblem main theme.
https://youtu.be/ZRcGHIp8KvY?t=12m56s They talk over it but it's recognisable.