The new maps show the route of the extension as being Kings George V to
Shadwell.

Bank is already at capacity, or close to capacity (or rather the
Bank/Tower Gateway junction is) with the Lewisham services I doubt they'd
be able to fit any more in there and they can't take any out as the trains
are crowded as it is.
--

The new maps do 'appear' to show that the airport extension will run
between King George V and Shadwell but if you look closely, you can see
that the section from Shadwell to Bank is covered over in white and
will presumably be removed once the extension is open. I would imagine
that this is to prevent passengers at stations from Poplar to Canning
Town hanging around waiting for a Bank service before the extension
opens. I think the new maps are quite helpful in showing a pattern of
service but I wonder whether the time has come to give each line a
separate identity as the network grows into a more and more complicated
beast.

Given the large number of people who would want to travel from Canary
Wharf and from the Lewisham branch to the airport, I'm disappointed
that a change at Poplar will initially be required to travel to the
airport.

Currently, the daytime 10 minute service to Stratford from Lewisham is
timed for cross platform interchange between this service and the Tower
Gateway to Beckton service. I wonder if this arrangement will continue.
It's very handy but would be even handier if the connection were made
between the Lewisham - Stratford and Bank - Airport service instead.