The head of the Peoples' Bank of China has made headlines recently proposing that the IMF's Special Drawing Rights (SDR) replace the dollar as a world reserve currency. An excellent discussion of this issue has been put up by Brad Setser at http://blogs.cfr.org/setser. There are some reasons why it is unlikely without some other very big changes, and that indeed the idea rather conflicts with what has been Chinese currency policy.
The main problem is that despite being created to replace gold as "paper gold," the SDR is not a currency at all. It is strictly a unit of account used by the IMF, currently with a value based on a basket of the US dollar, the euro, the British pound, and the Japanese yen, with the German mark and French franc preceding the euro before it replaced them. Presumably an altered SDR that brought in some other currencies, presumably including at least the Chinese yuan/renmimbi, could serve as a better measure of global value, but unless the IMF starts actually issuing actual SDRs, there is no way it will serve as a reserve currency. As it is, even the reserves of the IMF in other currencies, measured in SDRs, is only $200 billion, likely to be inadequate for dealing with the emerging financial crises in various Eastern European and other "peripheral" countries.
The problem for China is that they have been pegging to the US dollar. They are becoming uneasy about the value of their dollar holdings, but a decline of the dollar would keep their exports competitive with other countries (besides the US), which seems to be a major concern of theirs. If they were to peg to the SDR, whatever is in its basket, they could damage their export competitiveness. As it is, while some countries used to peg to the SDR, very few do anymore, with one of the most recent to abandon doing so being Latvia, which switched to pegging to the euro, big surprise.