It looks like that Foundation DLC is finally arriving sometime later in March!
The studio's communications director Thomas Puha tweeted that Remedy will drop The Foundation DLC at some point this March. With that expansion's launch, which is part of the game's $25 Season Pass, Remedy will also implement some quality-of-life improvements to enhance Control's gameplay. These improvements include more tweaks to the maligned map and "some other requested" changes. Puha provided no concrete date for when to expect these adjustments, but he did say Remedy will "show and talk about it soon."
The Foundation will be Control's first major expansion and follows December 2019's Expeditions DLC. Revealed as part of Control's roadmap, The Foundation will see Jesse Faden descend beneath the Bureau to restore order the Oldest House. The Foundation originally had a vague "early 2020" date attached to it and will be followed-up by Control's second expansion, AWE, in mid-2020. It seems the AWE DLC may connect Control to one of Remedy's most popular games, 2010's Alan Wake.
I am ALL ABOUT that DLC. Control was easily my GOTY last year and I am way looking forward to more of that story. Really hoping the game was successful enough to earn a sequel at some point down the road.