Edit/Update: @Brucehankins I think you are right, and that T10440 and T10476 are simultaneous projects. The header to T10476 says "The bigger feature release after 4.4" It looks like T10440 will be a quick ISO build pushed out quickly and T10476 will be released when planned features have been incorporated. Don't know why T10440 seems to have been dropped from the list.
Brucehankins Maybe, but T10440 doesn't seem to be on the list anymore:
Your guess is as good as mine, but I think that T10440 has been superseded by T10476.