We've been busy with ORAS stuff these last few days, so that new info really went under my radar, but the Twilight Princess-themed DLC pack for Hyrule Warriors is coming out soon (next Thursday, in fact). We were promised a new character and a new weapon, and I think what we got in terms of the former was a pretty surprising twist. I mean, Link, Zelda, Ganondorf, Midna, Zant and even Agitha were already there, so who could be added? Rusl? Yeto? Auru and his big-ass rocket launcher? Gor Coron and his rock-hard Goron nipples?
Well, what we got instead was Twili Midna, as in, Midna's true form. I did NOT expect that. Her weapon is the Mirror of Twilight... looking forward to seeing how that'll play out. As for the additional weapon, you're never going to believe it, but it's NOT for Link! It's actually for Zelda, and it's the super-awesome Dominion Rod! I loved that thing so much in TP, I can't overstate my happiness. I'm just hoping it's usable, I'm not a fan of the Rapier (though it might just be because I'm doing it wrong), and her Baton moveset is right up there with Agitha in terms of how much ass it sucks.
No info on the extra costume and whatever quirks (if any) will be featured in the new adventure map.
On that note, Amiibo functionality has been explained a bit. As mentioned before, the Link one gives you the Spinner, but the Zelda one does NOT unlock a weapon for her: instead you can use it once every day to get a random weapon that's three stars or higher. Any other Amiibo can be used once a day to get a random weapon that's three stars or lower, a random material, or Rupees. Still not worth the money unless you're a collector.