Later today, I believe, they will. On the post they put up from "Admiral Hackett", it should up for everyone by 5 PM PST.
OR
Maybe they don't want to be quick about it, and show they had the DLC ready to go.
Could be either, at this point. No matter what, it's obvious they weren't ready for the ****storm that has come their way.
Bioware clearly doesn't know what to do. If they say nothing, they piss people off. If they say something to try and "connect" with the fans to try can calm people down, they piss people off.
It's obvious that they don't want to literally commit to making a new ending, because that would require actual money being spent...if there isn't one already being made.
Making DLC isn't free. They'd need to get things past EA first. And if they promise something they cannot deliver...that'll piss people off even more.
I think they're trying to calm people down, first and foremost. They just haven't figured out a way that doesn't box them into a corner.