Vodafone today is out with an ad in The Times of India
which called for bookings from existing users by sending an sms with the word IPHONE to 56789.
Obviously there are no details on pricing and availability et al. All indications are that the phone will be available sometime in October (probably in time for Diwali).
Stay Tuned...
Update: You could also now book online at http://www.vodafone.in/
Update: More iPhone India news here
. I just need to figure out someone to carry it back from the states...