For some reason, I can't join the openmeta google group to post a request, not sure why. But anyway great news to see Rob was on the case so promptly.
The idea of having two plugins seems a bit awkward for us users. Because the OpenMeta and Mavericks tag is almost identical, having the new plugin set both in Mavericks means that those tags will be backwards tag compatible < 10.9 -- so if you dropbox sync your tagged files between a 10.8 and 10.9 machine you can use openmeta on 10.8 and Mavericks on 10.9). This would seem to obviate the need for the user to "choose" which tagging mechanism they will employ.
It seems that Ironic software apps like Leap will auto convert all openmeta tags to Mavericks, as will Houdahspot. For anyone who wants to hack this manually, there is a shell script available to do so:
When you have tagged files scattered over many directories it would be nice to search by tag first, then convert, rather than do this by directory, I suspect the mechanisms to smart update openmeta tags will improve once Mavericks gets into the wild.
Thanks!