I didn't play in Career mode, and only had access to the cars available in the "Rental Cars" menu (yes, that's actually what it was called). All of the available cars were 'Premium' with full interiors, but of course, who can really say? There is no longer an official distinction between Premiums and Standards. All of the cars I saw looked great, so there's nothing else relevant that I can comment on.
I also don't think you guys understand what these media events are like. I got to play the game for approximately 45 total minutes or so, split between presentations, frantically keeping the news blog updated on a cell phone wifi hotspot in the middle of the Mojave desert, getting as much info as I can in impromptu interviews with SCEA folks, and doing the actual track driving. It's not like sitting in your home exploring the game all day. I did get some gameplay footage (from which those screenshots you saw in the post were taken) which I will post later.