The Before Awakening map gives you an Exalt Brand and Hero's Brand for Lodestar and Great Lord class changing. The dialogue is fun too.
Boo Camp is the only way to grind XP in Conquest, which is nice if you hit a wall or want to hone perfect teams in a single game, it scales with your progress and is a bit of a challenge so its not a free xp party.
There is a money map too, again the only way to grind in conquest for money.
Really, if you love the game the entire first wave is worth buying in the bundle because it gets you all of the DLC classes like Witch, Balistician, Dread Fighter, Vanguard, Grandmaster, Lodestar, and Great Lord. Do note that the last two are only given once per save file.
The second pack is much cheaper, but only needed if you crave a new Fates mini-campaign. 7 maps in an alternate story line. If you ignore the kids in Fates because of the Deeprealms thing, this could be a nice alternative way to enjoy those characters without that clumsy mechanic.
There are signs of a 3rd pack of DLC planned because of some unreleased items in the game, a lack of a repeatable way to get Great Lord and Lodestar, and there being no 5-star maps like Apotheosis despite the DLC maps using a 5-star difficulty system (why not leave it at 4 if that is the max).
Along with a theoretical 3rd DLC pack, there is hope that Roy/Corrin amiibo support will be added as well. I'm betting we will see it this Fall, around the time we get the Corrin amiibo in stores.