Here's the link to my initial (and very limited) work on integrating weld:
https://svn.jboss.org/repos/errai/projects/weld-integration/trunk
CDI Spec can be found here:
http://jcp.org/aboutJava/communityprocess/pfd/jsr299/index2.html
The Eventing Model is especially interesting wrt the bus.
Fell free to hack along.
/Heiko