It's simple Saifur, when the world will be using 5G India will be using 4G..ha ha just joking!..I am expecting it to come in India most probably next year, that is, by 2012 according to a latest report on 4G. So stay tuned friend and let's wait till the time...
3g takes too much time for launching.. In fact it was quite late. So hope 4g will not take the same time.. There is no official date so far but I guess it should be in India by end of current year or may be next year.