I think I see the angle they're taking in that trailer. It doesn't spell it out, but GT is going to try and do something that the other games aren't doing, rather than simply doing everything they've seen the others do in the past few years.
What they need to do is a little of both. We'll see.
(I see them doing a lot more with motorsports than the others, FIA is only a small part. Might be a lot more historical cars than we've seen lately)
If the game's put together well (a big maybe), and the content is really amazing, this could be the next big thing. But, we'll have likely a couple years to be teased and speculate. Should keep some forums busy for a while!