Expansion/Downloadable Content
SPOILER WARNING
As of right now, there’s no hint to any kind of expansion or DLC content. When you examine the endings you can probably see why. Depending on which ending you choose, the story goes in one of three directions. Either you leave the nighmare, gain control of it, or are reborn as something new. Neither of the three really open the game up for post-story expansions. The story of Bloodborne fits on its disc nicely without much spillover.
This leaves anything taking place after the main game in a position of not making much sense. In one way, it’s great that the developers didn’t leave an obvious cliffhanger that they could later exploit for DLC, but it does make expanding the existing game a bit more difficult.
So if an end game expansion isn’t optimal, why not some new in-game content? New chalice dungeons, extra areas housing powerful bosses, or something else along those lines. Dark Souls II had its Lost Crowns Trilogy, that added new areas, weapons, items, enemies, and, most importantly, bosses. From Software could take the same approach with Bloodborne. Especially if the added content would shed more light on the deep lore present in Yharnam and its surrounding areas.
Perhaps a trio of new Great Ones would be fitting for Bloodborne DLC. Great Ones that would reside in their own respective nightmares, providing From Software a bit of freedom in creating new, interesting locales for hunters to explore, and plunder. With each new Great One, more info about the blood found everywhere in the game could be shared, and a deeper meaning to the hunt could be uncovered.
The developers built themselves quite the foundation to build on, and DLC is definitely a path they could take to make fans happy. However, DLC isn’t the only way to provide fans more of what they want.