Kurt Angle confirmed today via Twitter than Samoa Joe will be replaced by Elias Sampson in the Mixed Match Challenge as an injury has sidelined him. It seems they are also unsure at this point of he will be ready to go in time for the Royal Rumble.
WWE has released a statement on Joe's condition stating during his match on RAW against Rhyno, Joe felt a pop at the bottom of his right foot. It is believed to be a plantar fascia rupture but will need an MRI to confirm. Treatments include immobilization and platelet rich plasma injections. The normal recovery time for an injury like this in between 3 - 4 months.
On a positive note, Joe also announced that he is joining the cast of a new Transformers animated serious. He will be the voice of Predaking, a decepticon. Of course.