The Chinese yuan is becoming a central currency: 6 things you need to know - Yahoo Finance
It's just been granted reserve status by the IMF.
What this means is that the Chinese Yuan (aka RMB) is now a reserve currency, with a weighting HIGHER than the Pound or Japanese Yen. It has a weighting much lower than the USD or Euro but that's actually how it should be.
Now people will (eventually) talk about the majors as being USD, Euro and Yuan instead of USD, Euro, Pound (or Yen).
The SDR is (Special Drawing Right) is basically an IMF currency formed of a basket of the below currencies:
Official weighting info from the report - the yuan will officially become a member of the basket as of Oct. 1, 2016, and the currencies will be weighted as follows:
U.S. dollar -- 41.73%
Euro -- 30.93%
Yuan -- 10.92%
Yen -- 8.33%
Pound -- 8.09%