We've already gotten a taste of it. Earlier this year they released a "demo" for their driving contest they hold every so often. That "demo" utilized unfinished versions of th GT6 engines. Digital Foundry did an article about it and had both good and bad things to say. If I remember correctly, it maintained a frame rate in the high 40s, but I'm sure you can find the article. Keep in mind that it wasn't even an official demo for GT6, but just something they pumped out for their contests.
Why are you so fixated with just the screenshots? Watch the real-time videos instead.