The Chinese Grand Prix is now the third round instead of the 15th, and will be held in April. This means F1 will have visited the circuit twice within seven months, and next year’s Grand Prix may see different climactic conditions to what we have been used to.
At the end of the calendar the final race of the season, at the new Yas Island Marina circuit for the inaugural Abu Dhabi Grand Prix, has been brought forward by two weeks, reducing the total duration of the season by the same amount. The Brazilian round has been moved forward two weeks and the Japanese round by one week.
There is no indication that the missing rounds at Montreal (Canadian Grand Prix) and Magny-Cours (French Grand Prix) may be reinstated.
Full updated calendar details here: 2009 F1 calendar