Yes, rules have changed now. Earlier some quota was designated for confirmation of Waitlisted Tatkal quota tickets. But in new rules all the unused quota will be first allotted to clear general waiting list and leftover if any will be given for tatkal. Tatkal WL will clear only from cancelled confirmed tatkal tickets. And with zero refund policy of IR, I don't think anyone will cancel the ticket. Although the seat may go empty and TTE makes some bucks from it. Agar aapko GNWL me 200 waiting mil raha hai aur tatkal me 5, to jyada chances Gwl 200 ke confirmation ke hai na ki tatkal ke..