I think we'll get
's trailer for sure, and maybe a little more details on some of the new modes. I'm hoping they'll clear up more news on DLC too, such as whether Mewtwo is a special case and there won't be anymore (which I doubt, because that would be dumb), and whether DLC will also include things like stages (guess that's kind of confirmed already with the Miiverse stage?) and alts (which I'm almost more excited for than the possibility of more characters).
I've actually had trouble finding Christmas FE:A pics compared to Halloween. The only ones I could find much were the one with the kids I posted earlier, a Walhart x Robin one with Morgan, and a Gaius x Sumia one that will likely be my holiday icon because it is cute. I seem to recall one I saw on Tumblr with Laurent wrapped in Christmas lights too. Oh, and another one with Chrom and female Robin in Christmas outfits (though not in the same pic- it was a set).
Okay, poking around Pixiv more, there's also this, which I can post here because Lucina is in it, yay!
EDIT:
I've only tried Robcina for male Robin, but I'm also interested in Lissa, Panne, Tiki, Sumia, Cynthia, Olivia, Say'ri, and Emmeryn. And I'm sure I forgot someone in there because I always seem to with how many characters I love in this game.