Although Japanese automakers foresee a strong earnings rebound for the business year ending next March, experts remain cautious about extended gains amid intensifying global competition and persistent strength in the yen.

The key points are how they can fight the surging competition in the recovering U.S. economy as well as emerging markets, they said.

Global competition is heating up fast, and the once-struggling Detroit Three have bounced back and are regaining profits on U.S. car sales.