Nothing legitimately, so far.
But there's lots of bootlegs of shows:
Rainbow Theatre 74
Hammersmith Odeon Xmas 75
Hyde Park 76
Earls Court 77
Houston 77
Tokyo 78 (or is 79?)
Then there's several documentaries that were done for TV in various countries at the time, tehre's one from Spain, and one from Paris, that I know about.
This is one Queen decision that I STRONGLY object to. While I love 'On Fire: Live at the Bowl' being remastered and released officialy, I still think that with Montreal '81, Wembley '86, as well as no longer in print official releases like Budapest '86 and Rio De Janero '84, it would have been much wiser to go with Earl's Court, Houston or Hammersmith '79 not just to cover the spectrum, but more so to have a concert from Queen's early, strongest days.
The good news is that I sense all the pro recordings will one day be available with update treatments(DTS) and extras. Personally I feel that with Live at the Bowl 2 years ago and Return of the Champs last year, plus next year's studio album, it would be nice to see this year get some sort of release like a live 70's concert, one of those above.