Calendar's getting congested and this: http://www.mehrnews.com/en/newsdetail.aspx?NewsID=1401282 could only make things worse. I wish them luck with that as long as it's not made by Tilke.
Ive also heard Thailand are planning to enter on top of: http://www.not606.com/content.php/1112-Future-Races-on-the-calendar-(Gossip)
I don't believe that a country should be allowed to host two GP's, but having said that it would be great to see Imola back in F1. While it wasn't the best place for overtaking but it was still a great track. The problem is, how can it return? It won't replace Monza and there are plenty of new circuits being introduced.
I think the Concorde agreement for a 20-race season could go out the window at any time because the calendar is expanding at a huge rate. We've only got seven European races atm which isn't enough and a truckload of pointless Asian and Middle East races and plans coming left, right and centre, not that Bernie could care. A lot of these countries (Iran will be one of them) won't actually get the green light but they can dream. You need the most important countries on the calendar for a 20-race season and not one country in the entire continent of Africa is on the calendar.