well I run in the AH @Orgrimmar today and used my Nitro Boosts suddenly I got a backfire and it shot me up in the air. I landed above the Org AH
[SPOILER][/SPOILER]
so since the patch you also got a chance to get a backfire in azeroth. maybe it'll be useful to explore some places e.g. top of gurubashi arena. (and yeah I know it'll be kinda useless @cataclysm release, because you can explore nearly everything with flying mounts. but I thought it could be useful atm)