Not sure why all the complaints, however you slice it we are looking at 150-200 "new" cars, which will almost certainly all be premium. We've seen just a very small selection of those in the trailer, and they are great choices, but there will be at least 140 more. For me that's very promising indeed
It also looks like at least one car has been promoted from standard to premium, perhaps others besides. If you read Jordan's news post he says 1200 cars in total, so the "new" cars wouldn't include any upgraded standards (unless the likes of the LP400 still appear as a standard too...hmm! But then I don't think they can count it twice?)
Any GT game and indeed any driving franchise typically retains the tracks from the previous game, and they are adding more from the off, plus downloadable tracks. How much more exactly are people expecting? Take Forza 4, which I think is also a great game, but which also retains tracks from previous games in the series, with just a smattering of new ones besides. And has a similar amount of cars to GT5's premium count.
Add to all of this new suspension model, tyre deg, improved UI (woot!) and no doubt many other tweaks (hopefully improvements to shadows, and silly omissions like the clunkiness of lap record tables etc) and I think this is shaping up just fine
EDIT: Hmm just read intervening posts and I can see I was a little off regarding the increase in cars, I was looking at the master list from the front page of GTPlanet which counts 1031 and I guessed about 20 DLC cars max, which was also wrong! Still, 60 new premiums (plus DLC) sounds OK to me