Saudi Arabia's feud with Iran over the beheading of a prominent Shiite cleric led to a lot of overwrought speculation about Sunni-Shiite tensions rising to tear up the Middle East. Those more steeped in regional affairs point to the other 46 men beheaded, almost all of whom were Sunnis charged with terrorism.

The theory here is that the execution of the preacher, Nimr al-Nimr, was less about provoking Shiites than pre-empting domestic outrage over the deaths of so many Sunnis, who make up 85 percent of the country's population. The kingdom has rarely been concerned with domestic opinion in its 90 years of statehood. Does Saudi Arabia now fear unrest among the masses? Should it?

Outside of North Korea and the New England Patriots, few institutions are more opaque than the Saudi royal court. But over the last year, the first in the reign of 80-year-old King Salman, the famously hidebound monarchy has undergone a shocking and risky makeover.