It was reported how there was talk of having a special referee in the Roman Reigns vs. Triple H WWE World Heavyweight Title Match at WrestleMania 32 but that obviously didn’t happen. Vince McMahon was behind the idea at one point but in the end he made the decision for no major interference, besides Stephanie McMahon, because he wanted Reigns to win the title without any help whatsoever.
Vince and Triple H were visibly at odds over the decision as Triple H had been pushing for Shawn Michaels to be the special referee. Apparently this is why Shawn was in exceptional physical shape as he had been preparing.
There had also been speculation, but no real internal talk, of The Rock possibly appearing with Reigns in some way at WrestleMania. Word is that The Rock’s business team had him kept away from his cousin due to the potential of heat from the fans.