Automatron: March, $10
The Mechanist (who you may remember from a hilarious Fallout 3 sidequest) has unleashed a horde of robots on the Commonwealth, and it's up to you to stop him. In addition, you can harvest their parts to make your own handy robot companions, with hundreds of options to choose from!
Wasteland Workshop: April, $5
In addition to adding new options to settlement building, this add-on lets you capture creatures from the wasteland, and tame them...

FYI: If you get it through greenman gaming you can get 20% off using this code: FEBURY-SVINGS-20PERC
http://www.greenmangaming.com/
Since we don't know what extra DLC they are adding it's hard to say how great this is going to be and based on past Fallout DLC I am not so disposed to think this will be better than the main game stuff. That said, from what they've talked about so far this seems like a solid dose of "more of what people want." More building stuff? Check. More missions featuring robots? Check. Wasteland Pokemon simulator? Check. Huge new campaign in a totally new area? Check. All that seems like a solid $30 value but the Fo3 DLC was hit or miss for me so I have some reservations.
The part that's harder to gauge is the extra content. They say it's a solid $60 and I trust that intention so I am really curious what it's going to be. Simply based on what we know now the $30 is a good value and just one more DLC would still make it a good deal.
Anyways, I wasn't planning on getting it but with the Greenman deal plus the price jumping to $60 later I pulled the trigger.
So... very... weak.
I haven't been disappointed with any Bethesda DLC (not counting horse armor). Some has been better than others, but they've all been solid (except horse armor).
Horse armor? That sounds fun. How could horse armor be bad?
You know, horse armor gets shit on a lot, but it was a good addition to the game. It just shouldn't have been as expensive as it was on launch, that was the problem.