paul wrote in response to the question:
Would this mean that Euston loses the DC service, or will the
infrastructure be able to cope with the current EUS-WAT services, as
well as services through Primrose Hill etc.?

I think the various bits of TfL info on the www suggests there will be no
service into Euston on the DC lines - whether or not the third rail is
retained for diversions etc is another question of course.

Diverting the Watford LNWR DC lines to the Bakerloo will increase
capacity by using 7(albeit tube gauge) cars on the Watford London
corridor as opposed the 313/508 3 and 6 car mix For existing
passengers to Euston and beyond - changes at Baker Street for existing
Circle/Metroplitan transit passengers and Oxford Circus or Green Park
for almost every other tube interchange.

Paths will be freed from Camden Junction to Euston and then rebuilding
Euston platforms 9 and 10 in line with the overall rebuilding the
station could take place. The probable result would be fewer but
longer platforms at Euston more suited to 12 car outer surburban or
Pendolino operation.

NLL Termination on platform 1 at Queens Park in the southbound morning
peak to platform 4 in the northbound evening peak to facilitate cross
platforminterchange needs a facing crossover south of Queens Park but
personally I think non conflicting termination at Willesden DC bay
platform 2 is a better option - filling in the vacant space to allow
access/egress from both sides ala White City is better.