alwaystouchout.com reports two developments under
development/consideration.
1: The takeover of the Queens Park - Watford Junction section by LUL
Bakerloo line trains will free up capacity for the Willesden - Primrose
Hill - Points East Service.

This seems sensible if combined with the building of the Croxley link -
allowing Watford semifasts via Baker Street to reach Euston Square in
the same or less time as the existing DC service. Is this feasible? Or
will Watford-Euston passengers be allowed to join any Euston bound
train in a similar manner to the commuters from Wolverhampton to
Birmingham New Street? What will happen to to the spare platform
capacity created at Euston?

2: Extending GOBLIN to Rainham to access the Thames Gateway.

Why stop at Rainham and not push on to Tilbury?
As the line from Barking to Rainham is already electrified at 25kv as
are large parts of the NLL - in this interests of broader operational
rationalisation would it not make sense for all stock including the ELL
to be dual voltage?
On a whole life cycle basis which is cheaper per mile 25kv overhead or
750v DC third rail?