Autocar India says that it is possible that the inaugural F1 GP of India will be postponed to the 4th of December in order to accommodate the GP of Bahrain in case it is reinstated on the calender this year.  The 3rd of June is the date when a decision on Bahrain will be taken and that is when the dates of both GPs would be known.  If the Indian GP does get postponed it will be the season finale.