Unicode 8.0.0 was released on 17 June 2015 and include 'Sutton
Signwriting' as a new notational system, see
http://www.unicode.org/versions/Unicode8.0.0/ Briefly, Sutton is to sign
worldwide languages what the Latin alphabet is to European vocal languages.
Is anyone thinking about or working on TEI (or any XML dialect) in this
kind of context?
The only non-specialist open source software I'm aware of so far that
supports Sutton is wikimedia, see for example: