The studio is "sorry for the disappointment" to PC players but "timing and technical issues" scuttled the desktop versions. DLC will get gameplay patches.
"We are planning patches for the 360 and PS3 to fix some functionality issues, but they will not drastically change gameplay (and I’ll post the patch notes when I get them – these two items are still in with QA.)" 2K Elizabeth.
"We will also not be offering Protector Trials and Minerva’s Den on the PC in the future – and I want to say that I’m sorry for the disappointment this will cause to PC players out there," she said. "Timing and technical issues were the problem."
There may still come a time when the DLC could make it to PC but going by the general consensus on the official 2K forums by users, few if any are hopeful.