The PC edition of Minerva's Den DLC for BioShock 2 is on its way apparently, despite reports earlier this month that 2K won't be releasing it. Here's the company's explanation as to why they wanted to can the DLC initially:

When we announced that Protector Trials and Minerva's Den would not be coming out for the PC due to technical and timing issues, we received a lot of feedback (much of it understandably expressing disappointment and anger) about our decision.

In terms of the patch and the Protector Trials, we had a working build but there were bugs in the code that would trigger problems with the game during specific situations, and we were not happy enough with the status of the build to release it for certification with Microsoft.

However, fans were not pleased with the news and their response has influenced the devs to change their minds. "Given the conversations we've had over the past two weeks, we've decided to go back and finish the PC patch and Protector Trials."

The patch and Protector's Trials will be free 2K and will most likely certification in December. Regarding Minerva's Den, "it was not in a workable state [when we stopped development] and needed significantly more dev time to complete." Still, no release date was given.