Damn, was hoping it would be on Sommet. I would have got up to watch that.
Unfortunately Sky already bought the rights a few years ago and it's the only Championship game they broadcast every year.
Would make more sense to eventually have the Champ Play-off final on Sommet since they have rights to the regular season and all the other Play-off games.
Will be no end of live streams available for free though.
You can watch all the Sky Sports channels from the UK streaming live here for free:
http://www.coolsport.tv/skysports1-hd.html
The Championship Play-off is on at 2 am NZT on Sky Sport 1 in the UK.
Sky Sport UK football schedule:
http://www1.skysports.com/watch/football-on-sky
Big games such as this plus the major European leagues usually end up a day or two later to watch for free online on these sites:
http://www.matchhighlight.com/
http://livefootballvideo.com/fullmatch