Great to hear that
it seems Dmitry(cced) is interested as well and he might lead this effort (so I guess you can sync on next steps)
his repo is here:
https://github.com/DmitryKey/luke/and he started moving UI to GWT so aiming for above jira issue - someone however should update it and ping lucene folks
their svn luke fortk is using
http://pivot.apache.org/, but I guess GWT could work too (I'd talk to them to avoid duplicate research)
It would be really cool to finish the port(hence get rid of legal/license issues) and move it to them so they update it whenever new lucene comes out (after all they know lucene the best ;) )
thank you for your interest/help
Lubos