No, it's conspiracy theory
IMF: a new global currency issued by a global central bank
Finally, in principle, a new global currency issued by a global central bank, with robust governance and institutional features, could provide a nominal anchor and risk-free asset for the system independent of national currencies. This global central bank could also serve as a lender of last resort. But any such step requires considerably more debate on its merits, including on the need for a safety valve for the system given errors that might inevitably occur, as well as of its feasibility, given the very substantial multilateral effort required. I fear we are still very far from that level of global collaboration.
http://www.imf.org/external/np/speeches/2010/051110.htm