Futures on Offshore RMBs are available at least on SGX and in the US (I think CME but might be other exchanges) SGX also offers futures on onshore RMB if I recall properly, and HKSE might offer them as well, easy to double check through their websites.
I don't think you really can. Just looking at the volume and charts, http://www.cmegroup.com/trading/fx/emerging-market/usd-cnh.html Unless you trade elsewhere as luis pointed out. Dunno what the fees will be elsewhere, perhaps som1 can help there. AMP futures do offer them, you won't find better IMO. http://www.ampfutures.com/trading-info/contract-specifications/