Aircel has finally announced on their facebook page that iPhone 4S is coming to India on November 25th. Also they have updated their iPhone page saying iPhone 4S pre-booking starts on 18th November.
Tough no information and other pricing/tariff details are given. It is expected that Aircel & Airtel will launch the new iPhone model under Reverse Subsidy Model only, the way iPhone 4S was launched few months back.
Check the Aircel Page here