LaTeX3-sensitive editors

LaTeX3-sensitive editors

I'm starting to embed LaTeX3 code in my custom classes and packages -- and
enjoying it more the further I learn about it --, but at least to me it
would make for an even better experience if, as it is common in the
computer languages I work with regularly, I could use some editor
sensitive to LaTeX3 in terms, at least, of highlighting.
It may be a little too early for this, given that the interface (and the
implementation itself, as far as my knowledge goes) is still work in
progress and not everything that is already available is stable, but
entire stability (if there is such a thing) may be far ahead on the road
and it seems to me that we already have elements considered stable enough
for us to benefit from such editing features.
True, one could always setup a favorite text editor accordingly (WinEdt is
my regular editor for all things TeX, but I'm not committed to any editor
in particular), but I'm asking for something already made... and trying to
bring the attention of developers to this topic.
Anyone knows of some editor out there with this kind of features? Are
there any projects in this direction?