Mr Thant wrote:

At Stratford they've started advertising the move of London Overground
to its new platforms upstairs (from January 2nd),

Ah you beat me to it!

So I'm guessing the platforms downstairs will reopen as 16 and 17,
giving a nice consecutive 13-14/15-16-17 with the Jubilee Line
platforms.

Don't the Jubilee Line platforms go the other way? So it would be
16-17-13-14-15?

On the other hand, the upstairs platforms will be
1/2-12-11/10A-10/9-8/6-5/3-3A-4B/4A (where / is an island). They can't
rationalise them either, as there will be 14 platforms** upstairs and
only numbers 1-12 available. Unless they renumber the Jubilee as
well...

A right fricking mess! And the passageways make it worse - there is no
single passageway linking all the platforms.