I'm afraid you'll need to wait for a jailbreak app to do this as, on an AppStore app, all you can do is play back shared ("Home Sharing") media from iTunes but in no way can edit the metadata and stuff.
There's an all-in-one JB app (iMedia) in the Cydia store but it seems it's unable to even show local metadata, let alone remote (iTunes) one - if you meant remote editing and not local (synched) one.