A post to an Ask Capcom Thread from Capcom's Christian Svensson explains that there will probably be a considerable delay before a PC edition of Resident Evil 6 is released to prevent another Resident Evil 4 debacle (thanks Strategy Informer). Here's word:

It is a small, but appropriately sized team working on the RE6 PC project. It is a different group than originally planned, lest it would have taken even longer than it currently will but this team will do a better job than what was being considered originally.

The process did not begin until after the console versions were complete, submitted, approved by console 1st parties to use that final codebase as the starting point.

It will be some time still before we provide details on release dates and PC specific parameters.

Projects like this you guys seem to think are "trivial" but they are not. When they get treated as trivial, you end up with Resident Evil 4 PC... which I don't think too many true fans were pleased with.