As of this writing, Samoa Joe does not have a match for Sunday’s WrestleMania event and most-likely won’t have one either. With twelve matches for the four-hour show and two-hour pre-show, the chances of him being tossed into a match last minute are very unlikely.
Dave Meltzer indicated in the latest installment of the Wrestling Observer Newsletter that Samoa Joe will probably be involved in the Seth Rollins vs. Triple H match in some degree. The company is planning a feud between Rollins & Joe post-WrestleMania and they could do an angle on the show to further the build for their blowoff match later down the road.