The Sogdian script has been accepted for encoding into a future version of the Unicode Standard. The script is in the Pipeline at U+10F30..U+10F6F.
A number of proposals for its inclusion have been submitted to the Unicode Technical Committee and WG2:
2000-02-15 Scripts from the Past in Future Versions of Unicode — Carl-Martin Bunz ( L2/00-128)
2000-04-26 Further comments on historic scripts — Carl-Martin Bunz ( L2/00-153)
2000-12-21 Encoding Iranian Scripts in Unicode, Iranianist meeting report from Paris — Carl-Martin Bunz ( L2/01-007)
2016-05-09 Preliminary proposal to encode Sogdian in Unicode — Anshuman Pandey ( L2/16-158)
Recommendations to UTC #148 August 2016 on Script Proposals — Deborah Anderson, Ken Whistler, Rick McGowan, Roozbeh Pournader, Andrew Glass, Laurentiu Iancu, and Lisa Moore ( L2/16-216) (See section 7 for recommendations)
2017-01-25 Revised proposal to encode the Sogdian script in Unicode — Anshuman Pandey ( L2/16-371)