It is still September... Yet E+ is available to you before the day of departure.^
I discovered this, because the E+ seats in my reservation on co.com was no longer grayed out.
You might have to call UA... but you can do it today.
See the full story here.
Originally Posted by
reinballe
I have great news about E+!!
For all us who were wondering.... When is it mid year?

.... Now we know!!!