Yes, what you heard is true. Aircel now offers unlimited 2G/3G data pack starting from Rs.9/- per day. The customers can enjoy 100 MB of data for basic net usage. There are other plans too like Rs.79/- for 1GB, Rs.249/- for 3GB and Rs.399/- for 7.5 GB of unlimited 2G/3G depending up on the circle.
I am sure other service providers would also come up with competitive packages soon.