There will be no Mir or Unity 8 in 14.04 (for the desktop) nor will there be any point releases during it's duration. It will all be Vanilla X.
Quoting Mark Shuttleworth:
"The question is whether we will adopt Mir and Unity 8 for the desktop in a point release of 14.04. No."
You can hear it here:
and please start at '48:50'
.. as we say in North America, .. 'That's all she wrote'.
I see that Phillinux has already adressed this