I know that TestNG is on the roadmap for Cactus. So as soon as Cactus supports it then JSFUnit will support it as well. If you have some time to help out on the Cactus project I know Petar Tachiev would love to have some new contributors. I can put you in contact if you are interested.
We will definitely have integration with Eclipse through JBoss Developer Studio. It will probably be the first major item after JSFUnit GA.
I am just beginning to work on Eclipse plugins. I am going to try to make Continuous Testing http://groups.csail.mit.edu/pag/continuoustesting/ current as my first project. I think I can help on the Cactus project some so connect me with Petar.
I don't know if Petar wants me to make his email address public. If you send me a private email, I'll get you two in touch with each other.