It is hard enough to keep up with rapidly evolving Java specs, so I do not expect IDEA to keep up with every open-source tool that comes out. Then again, some open-source tools emerge (e.g. Spring, Hibernate, Facelets) that become so popular that support would be a huge convenience.
I am aware of the Plugin API, but I wonder if there is some fervor for a mechanism support for open-source tools. Perhaps if x number of licensed users vote for something then it could be a feature in the next release. Is such a thing plausible?