Removing solution in SharePoint, keeping the pages with older webparts, redeploying updated solution with newer webparts

What I am trying to do is to keep SharePoint pages that were created i开发者_运维知识库n SharePoint while the solution underneath is retracted, updated, and then redeployed. Has anyone done this before, what issues may I run into?

I'm worried that the state of the old webparts on the page may use values that are incompatable with the newer updated webparts. Any advice would be great.

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Make sure that the new version web parts don't remove any properties and any added properties have default values - as long as you maintain backward compatibility in the code you shouldn't have any problems.