As of now margin requirements will remain the same, however from December 1st, the leverage you get for trading F&O in MIS will start reducing in phased manner and from September 2021, there will be no leverage offered for trading F&O in MIS, you will require NRML margins. Detailed explanation has been given in this post.
However, currently only change for you is, whatever profit you make you cannot use it on the same day, you will be able to use it only after it’s settled on T+1 day, as F&O settlement cycle is T+1 day.