This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
This capability is not built into Eclipse. Maybe someone knows of a plugin that will do this. But all you would really get is empty comment blocks which you would have to manually add the comment text to so I don't see the benefit, especially since the most you have to type is "/**<return>" at which point Eclipse creates the comment block skeleton for you.