Chris McCormick is working on it, alone as far as I know. (Don't want to talk for Chris) but it seems to me he's interested in porting oniy pd-vanilla tilde objects.
And he would need help too.
Anyway he published some useful guidelines and I think it shouldn't be difficult for someone knowing Javascript to port other externals or stuff.
http://mccormick.cx/dev/webpd/
M
Web-Pd is a project i'm very interested in - when it gets vanilla functionality, we'll have a chance to fabricate wonderful GUIs while
staying
in the browser, which means staying platform-independent (eventually browser-independent too).
are you the one doing this work? do you have any deadlines about when it will be finished? will it be vanilla-only, or is it possible to add externals?