Well, there's a bit of a difference between random Sony floor folk at a gaming convention, and the official PlayStation blog. The blog is where Kazunori originally announced the GT Sport delay, remember. Where do you suppose the blog got the information?
That said, anybody reasonably well-versed in marketing speak knows "never-before-seen" can mean just about anything. If there's been any changes to the game since the last big public showing (Geneva, IIRC), and the game is running a new version, then that's that box ticked. It doesn't even have to look different to qualify as a new version.
...then again, nobody has said "you lied to me Kaz", so I'm not sure what you're swinging at. Those that had any expectations of big reveals here have only themselves to blame.