The Nyiakeng Puachue Hmong script has been accepted for encoding into a future version of the Unicode Standard. The script is in the Pipeline at U+1E100..U+1E14F.
One proposal for its inclusion has been submitted to the Unicode Technical Committee and WG2:
2017-02-15 Proposal to encode the Nyiakeng Puachue Hmong in the UCS — Michael Everson (WG2 N4780, L2/17-002)
Recommendations to UTC #150 January 2017 on Script Proposals ( L2/17-037) (See point 10.)
UTC #150 Minutes ( L2/17-016) (See C.4 for decision and action items)
Recommendations to UTC #151 May 2017 on Script Proposals ( L2/17-153) (See point 10.)
UTC #151 Minutes ( L2/17-103) (See C.4 for decision and action items)