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Moto 3 is adding the RC390 and the R3.
http://www.roadracingworld.com/news/ccs-and-usgpru-adopting-new-moto3-class-rules-beginning-september-1-2015/
http://www.roadracingworld.com/news/ccs-and-usgpru-adopting-new-moto3-class-rules-beginning-september-1-2015/