Few of my close friends attend IIIT Lucknow and according to them, the new and permanent campus is still not that well developed. If you are looking for good college life at IIIT Lucknow, you will be disappointed. There is no canteen and fests.
Yes, there is an academic building and hostels but you will not get the exposure you are looking for. The faculty is not that great either. The placements are also not that impressive and most faculty are IIIT Allahabad graduates.
It will be better if you join any other old NIT or other colleges which is much better than IIIT Lucknow.