I don't recall seeing any mention of LaTeX3 on either developers or
users lists over the decade I've been following them. I "discovered"
LaTeX3 last year and was struck by how much easier it is to code in TeX
using the expl3 language of LaTeX3 rather than directly in TeX/LaTeX2e,
and also by the potential for LyX development in LaTeX3 packages like
xparse (for the treatment of arguments in insets), and xtemplate
(underlying a future LyX layout editor perhaps?).
There is currently a discussion taking place on the LaTeX3 mailing list
about graphical front ends to LaTeX3 in which LyX has been mentioned a
number of times (generally to be dismissed as not quite "cutting the
mustard"). It started with
Sean Allred "Feasibility of GUIs for authors and class designers in
LaTeX3" (28/01/2014) on late...@listserv.uni-heidelberg.de
and has had a number of responses since, including from Frank
Mittelbach. (Registering for this list is a bit fiddly.)
Andrew
PS I dream, years hence, of LyX 3 embodying LaTeX3 in much the way that
LyX 2 embodies LaTeX2e now, and then come to my senses with a start when
I realise that LyX 2.1.0 is still only a gleam in the eyes of its
developers.
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