WrestlingNewsSource.com has received the following image showing one of the items being sold at the WrestleMania Superstore at WrestleMania Axxess, which lists that the main event at WrestleMania 32 between Triple H and Roman Reigns for the WWE World Heavyweight Championship is a No Disqualification Match:

It is likely that this is a stipulation that may get added during WrestleMania itself, though this will obviously not be known until once the event itself starts. WrestlingNewsSource.com will continue to keep you updated as more information becomes available.