A downloadable expansion is coming to From Software's Bloodborne, Sony Computer Entertainment Worldwide Studios president Shuhei Yoshida said on Twitter today. Details on the forthcoming expansion will come later this year, Yoshida said.
Bloodborne producer Masaaki Yamagiwa added that that downloadable content is currently under production, and that a new update for Bloodborne — version 1.04 — is expected on May 25.
So I have been asked by many people if we are making DLC for Bloodborne. I can say... An expansion is coming. More info later this year. :D— Shuhei Yoshida (@yosp) May 21, 2015
From Software released downloadable content for the original Dark Souls, titled Artorias of the Abyss, about a year after the original game was released. The sequel, Dark Souls 2, had a trio of downloadable add-ons.
For more on Bloodborne, read Polygon's review.