Sooo...bought the Citadel DLC. So very, very worth it. I'm a big fan of Bioware, mostly of their ability to make such endearing characters. And get those characters you shall. A new hub, minigames, collectables....and of course a kickass mission with lots of great dialog from your favorites. For all the upheaval over the ending and whatnot, this absolutely felt like a love letter from Bioware to the fans. Feels a bit fan servicey (That a thing?) but I loved it.
Oh, details you ask?
Just...go get this. Combat isn't groundbreaking but it's a wonderful piece of DLC. Glad I bought it. It's a fitting final meeting with your squad mates and a great way to end the Shepard trilogy.