I think it's because it is not open to everyone in the top 64, only 2 players from any nation (I think) which had an effect on countries like Spain and France who have multiple players in that ranking.
I'm sure in Beijing the points awarded for gold was 800.
It was four players.
And Washington was running anyway, so those that couldn't play at the Olympics played in DC instead.
The scheduling is messed up. I'm not sure why they've actually shortened the season - why couldn't they leave it the same time and leave an extra week after the Olympics (Washington and co. could have been played then)?