I tried out the 'jboss7' branch in 'web-main' today, where my colleague Petr Hejl pushed the latest jboss7 patch, which he's been working on with contributors, especially M Pragalathan, who did a fantastic thing in starting the NetBeans/JBoss 7 work on his own initiative, in the related issue:
http://hg.netbeans.org/web-main/rev/f5bc69ac5215
For the adventurous, it's worth trying out. It will not be part of 7.3, too late for that, but a plugin could be made available once bugs and other issues have been fixed, and later it could end up in the standard JavaEE distribution of the IDE. No plans have been made for this yet, though, so watch this and other spaces.
Here I have JBoss 7.1.1 registered and running, with some applications deployed to it.
These are great steps forward!