FutureMigrationGuide

This page should be used to keep track of items which should be added to the migration guide. It's a living document for the life of a development cycle and by M4 should represent a significant proportion of items that are worthy of note in the migration guide. Once the migration guide for a release has been completed the contents of this page should be archived in a versioned subpage (i.e. FutureMigrationGuide/2.3)