The 1981 remix issue of "Frenzy" was supported by A&M in Canada, I think. I know it came out there and in the UK, and possibly not just as a bonus album with "Time and Tide". My vinyl copy, bought secondhand, seems to be a stand alone Canadian release.
Eddie is eager to remaster - and in some cases, remix - all the Split Enz albums. "Frenzy"/Luton is first on his wishlist but the start date for this project will depend on his other commitments and, I guess, a commitment from the record company. I would predict a mid-late 2006 release.