Hmm, what evidence do you have that China wants a gold-backed yuan? AFAIK, yuan is at present a fiat currency.
http://www.forbes.com/sites/steveforbes/2012/10/03/gold-can-...
RMB has lots of influence in Asia because many countries in the region are exporters to the US and Europe and in direct competition with China there. Countries like Malaysia have a managed-floating currency based largely on the value of the RMB to make sure that they can compete effectively with China on a day-to-day basis when dealing in foreign exchange. I believe this is part of the reason analysts tend to give the RMB too much credit, once China grows to the point of higher internal consumption and less export dependency we will see many Asian currencies reforumlate their floats to reduce the emphasis on China.