This next release (0.4) will have write support in our JCR implementation, and we're working on it now (the only thing left in the release, actually, and we're behind schedule). Hopefully not too much longer.
Search/query and events will be the next release. No date yet, but hopefully no more than 6 weeks after 0.4.
so we could get a preview of the write capability by checking out of svn and building ourself?
Not yet. :-) The work hasn't been committed to trunk at this point.
Stay tuned to our blog for updates, and when you can download the source to preview the new features.