“From the first 12 hours, decisions were issued,” says Prince Mohammed. “In the first 10 days, the entire government was restructured.” He spoke for eight hours over two interviews in Riyadh that provide a rare glimpse of the thinking of a new kind of Middle East potentate—one who tries to emulate Steve Jobs, credits video games with sparking ingenuity, and works 16-hour days in a land with no shortage of sinecures. ... The prince plans an IPO that could sell off “less than 5 percent” of Saudi Aramco, the national oil producer, which will be turned into the world’s biggest industrial conglomerate. The fund will diversify into nonpetroleum assets, hedging the kingdom’s nearly total dependence on oil for revenue.