Yeah, that's a little vague. When it says "iPad with retina display" do they mean both the iPad 3 and 4? I assume so, but currently the iPad 4 is the only iPad on Apple's site that is called "iPad with retina display".
I wouldn't put it past Apple to screw over iPad 3 owners yet again.
If ios8 struggles on the iPad 3; it may be a blessing rather than a screw over...