The world’s great oil power is expected to unveil a reform blueprint imminently. The brainchild of Muhammad bin Salman, the 30-year-old deputy crown prince, it could be the biggest shake-up since oil was discovered in the kingdom in 1938. His aim is to create an enormous sovereign-wealth fund, reportedly holding up to $2 trillion of assets—making investments, not oil, the main source of government revenue. The plans include an initial public offering of part of Saudi Aramco, the world’s biggest oil company. But Prince Muhammad’s impatience for change is well known; his ability to implement it, less so (even getting the Saudi bureaucracy to issue visas for journalists to attend the launch of his “Vision” proved difficult). Regional instability, aggravated by the prince’s detestation of Iran, could dog the project’s success. Will the vision stretch to letting Saudi women drive? That really would be radical.