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Following on from the replacement of 250cc with Moto2 - which has attracted a capacity field for its inaugural season - the new Moto3 category will be based around single cylinder 250cc four-stroke engines with a maximum bore of 81mm.
"The aim is to make this category more competitive and cheaper," said Dorna chief Carmelo Ezpeleta.
"Our idea now is to make it a multi-engine category and not a single-engine class.
"Many things are still to be discussed but it is to be implemented for the 2012 season."
The cost of engines will be capped at approximately 10,000 euro, and manufacturers must be prepared to supply up to 15 riders.
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