Short of it:
Dan Henderson pulled out with a knee injury.
Dana White asked Sonnen to step up and fight Jones Sonnen accepts, says he will fly to Vegas right now to fight Jones.
Jones turns down fight. Greg Jackson claims that if he takes Sonnen fight it will be Jones biggest mistake of his career.
UFC 151 is cancelled; all hell breaks loose as all the other fighters turn on Jones due to them not getting a pay day now.
Dana White is pissed.
Rumors now is that Dana offered Machida a fight against Jones and Machida turned it down now.
Here is the media call with the announcement: