Not sure if this has been posted, but It's been confirmed that the Inigo, Severa and Owain lookalikes are the actual Inigo, Severa and Owain, just under different names. However the Cordelia, Gaius and Tharja are just lookalikes. I did hear somewhere that the Tharja lookalike is Tharja reincarnated though. Also those six characters are the most popular characters, in Japan with the exception of Chrom and Lucina, but Lucina is technically a playable unit through amiibos.
Yeah I mentioned it before but I probably hid it under transparent text or something to avoid spoiling anyone.
Inigo and Owain have some great support conversations, the Owain/Ophelia one is probably my favourite. Owain has good genes
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When you recruit Flora you can make her your My Castle host instead of Felicia/Jakob. Nice. You also recruit her after the chapter she appears in by doing a random paralogue or streetpass battle. For those wondering about if she's neutral or not; she's only for Nohr master race :>
Third route will have infinite skirmishes like Hoshido but the difficulty will be somewhere between Nohr/Hoshitdo.
So, I looked at the classes that are in the game and it seems that the Nohr side has more traditional classes we all know (Knights, Riders, etc) and the Hoshido side has some....interesting classes. Not going to spoil them but some of them sound really bizarre.