Adobe will be dropping support for high profile bug fixes on the InDesign/InCopy CS3 code base end of April. We start to ship InDesign/InCopy 5.5 around that date depending on region and language version.
Adobe will after May 1st support three code bases. InDesign/InCopy CS4, CS5 and CS5.5
Partners and customers can still contact technical and developer support to seek help for CS3 related issues, adobe will provide guidance and workaround but will not deliver bug fixes on the InDesign CS3 code base.