I doubt it. As nitpicky (and lack of professionalism behind them) the majority of reviews were, the standard/premium debacle didn't weigh that much in their decision.

The thing is, the standard cars are all over the place in quality. Some plain just suck, like the Nissan Micra mm-R cup car, which looks like something taken from the worst quality PS2 game (even worse than the GT4 model), and then there are others who could easily pass for a Premium car, like the Mazda Furai, the Audi R8 LMS Race Car and the Polyphony Formula GT (I've got an amazing wallpaper from a FGT car which everyone thinks it's a premium). 

There's actually two versions of each premium model.  They have the higher poly models seen in GT5's photo mode, and slightly downgraded versions of those models used in-race.  Kaz has said that the photo mode premium models are PS4 quality (and they ain't lying!), and from what I gather they intend to use those models as in-race models for whichever GT hits PS4.

I think their current plan (pure speculation here!) is to upgrade GT5 with more premium models, while prepping GT6 as a PS4 title.  They'll transition all Premium models to GT6, while focusing on increasing and refining the franchise's feature set for that iteration.

I don't think we'll see much more cars in GT6 than GT5, aside from any new cars and concepts that surface between now and then.  It'll be all about polishing those cars and fine-tuning the other areas of the game.

Veyron

Will they charge for it?

10 cars updated - 5.99$ ?

Hopefully they won't do it, or at least not at such a ludicrous price. If they can add them via updates, I don't see why it can't be free.

Some of the cars not all of them.

Kazunori Yamauchi, head of the Gran Turismo series, has announced that some standard cars in the fifth chapter will be updated in the future to go to the "Premium".

To update 811 standard cars to premium would be insane and quite frankly asking for too much. Even if they update 220 more, that would be an amazing amount. 

Very nice. Looking forward to that, Polyphony. :)

IMO they released unfinished game, so all that should be free, but maybe they would like to make some more $$.

I hope they will fix psOne quality shadows too.

KY is already looking into the shadows: http://www.gtplanet.net/yamauchi-on-gt5s-mechanical-damage-updates-more/

The problem is, not all tracks have those jagged, blocky shadows. Tracks like London, Madrid and Tsukuba show some decent shadows, even from the grid start. Most of the shadow issues come in tracks with some kind of dynamic lightning in them. They seriously screwed up the coding for the dynamic shadows. Then again, there's just so much that can be done with 256 MB ram.

I also hope they address that issue, but I'd take the option of removing the HUD over better shadows any day