Don't worry, I suppose that so far they've only sent the invitations to candidates from under-represented regions. The Indian pool is the largest and that's why they need more time to decide. I expect your decisions to be sent after Easter Holidays.
My officer instructed me not to send the essays. Does anyone know if that was the case in previous years? Somehow I feel that the dynamics of the interviews will be affected by the change of topics for the essays. Since there were no specific "Why MBA" question, maybe the emphasis will be exclusively on those areas at the interviews?