Maybe they just can't be arsed dealing with the plethora of issues that will no-doubt plague the PC version on release at the same time as having to maintain the console versions.
When all said and done, the consoles account for the bulk of their sales so it shouldn't be much of a shock that that's where the focus is.
Thats fair enough, but I don't know why they can't just tell us straight. Then at least people know whether to buy it for console instead if it definitely isnt coming for PC.