Haven't played the game, so hopefully everything won't be too bad, but a lot of my concerns seemed to be shared with others and have already been posted.
-Some of the penalties that accompany some of the weapons feel like a bit much. Certain ones just feel flat-out unusable now.
-I'm a guy and I'd like a male Kanna.
-I actually love having Odin, Luna, and Lazward back, but the Tharja, Gaius, and Cordelia clones are wtf.
-The hairstyles for Kamui for both genders are hideous, but Femui has better options.
-Children returning and the bullshit excuse for having them.
-Having to marry a Kamui-sexual just to have all the children if you play as a male. Even though I hate the children, I'm a completionist and I'd really like to have all characters in one playthrough. I guess it's a good thing I'm planning on waifuing Flora and Anna at some point.
-Zero and Shara being the only gay options. I think Zero is fine, but Silas>>>>>>>>>