Hello
Nothing is confirmed in this mater till now, only NEXT exam will be proposed from 2022 is being said till now.
However, Its implementation will require major changes so thats its equal for everyone.
However The pass out mbbs graduates won't be required to write NEXT 1 but only NEXT 2 , results of which will determine their ranks for post graduation courses.
However NEXT 1 will be a eligiblity criteria for new mbbs graduates (equivalent to university finals of final year).
hope this helps