This is an enhancement meta-bug covering developer experience improvements, including various tasks to enable the creation of a new SDK incorporating a locked-down version of the build system. For the original proposal, see: https://lists.yoctoproject.org/pipermail/yocto/2014-August/021044.html
To be discussed internally.
This work is now tracked under bug 7783 as an umbrella, so we can close this one.
Verified as per above comments.