The wording of the announcement would be the biggest difference between an informal and a formal announcement. An informal announcement doesn't have to be as proper and politically correct as a formal announcement would need to be.
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formal is the cinema and informal is a gay man
A formal document would be the type a professional would send in the course of doing business. Informal would be they type you would send to a friend or relative. It would have less rigid structure, focusing more on the content. Also an informal document such as a text message or email does not have a layout but formal documents such as a letter or a newspaper article.
It should be formal. But what do I know :)
becuase formal communication is more important then informal, becuase your communication will be received, but when your informal communication may received or not.