This page should be used to keep track of items which should be added to the migration guide in the YP Reference Manual. 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 cleared out.

2.5 Migration Guide items

kernel.bbclass now supports multiple kernel packages. If your kernel recipe disables automatic installation of the kernel image using RDEPENDS_kernel-base = "" then to avoid warnings you will now need to use RDEPENDS_${KERNEL_PACKAGE_NAME}-base = "" instead.
We removed the fetchall and checkuriall tasks, "bitbake X --runall=fetch" and "bitbake X --runall=checkuri" replace them.

FutureMigrationGuide