One should be able to go to cdo office with necessary docs and apply for it now. The procedures and required docs are listed on rajpatra.the other group in the bill, the children of birth citizens who were not able to get citizenships before are already reciving actual ctzp. Nrn group is slow and it doesn not seem like there is much info out there about this , as of now.
Raj patra says you have show your renouncement of original citizenship before applying nrn ctzp. It will be a seperate ctzp card and it restricts u from political or administrative rights like other Nepali citizens.
If you wanna look at rajpatra ,there is another thread in sajha about dual ctzp and someone posted a link few days ago.

The excitement shown by nrns is very pathtic on this matter. This impacts everyone living abroad and their descendents for 3 generations at least. Its a big move but there is no news yet by NRNAs or so called leaders of nrn communities and most nrns seem to not care.