The meta-yocto layer has been split into two parts: meta-yocto and meta-yocto-bsp, corresponding to the Poky reference distro configuration and the reference hardware Board Support Packages (BSPs), respectively. When running BitBake or Hob for the first time after upgrading, your conf/bblayers.conf file will be updated to handle this change and you will be asked to re-run/restart for the changes to take effect.