....popped through my letterbox over the weekend.

There's only a single route option on the core section
(Euston-Waterloo), but most of the branches have several different
options. The differences are mostly comparatively minor, but two are
pretty big: the Waterloo to Oval section can run either via Lambeth
North and Kennington Cross, or via St George's, Elephant and Kennington
tube; while Euston to King's Cross has both a direct route and one via
Mornington Crescent and St Pancras Hospital.

The only other significant shift from the original plans is that the
Peckham branch is now planned to go beyond the bus station to Peckham
Rye station. This is presumably because it makes sense to link up with
the Overground Network, when it comes.

Jonn