Are Asian central banks using RMB as reserves now?

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Somebody said: The Russian Reuble is on the rise. China's Yuan (RMB) is on the rise. The U.S. Dollar is on the Down-ward slide, and it will continue to slide until a gabage-bag full will only exchange you for a bag of bread. The U.S. debt is already 3 Trillion U.S. dollars; they will never repay that Debt; practically, the U.S. is now bankrupt ! Many Asian Central Banks are using RMB as reserves. Why the bloody-hell Hong Kong Dollar is still pegged to the U.S. Dollar ? Any Comments on this ?