TfL press release:
http://www.tfl.gov.uk/corporate/media/newscentre/16039.aspx

---quote---
Northern line to operate as normal during evening this summer
29 June 2010

New Tube Lines team to work with London Underground (LU) on new
approach to upgrade

Transport for London (TfL) today cancelled the early evening closures
on the Northern line's Bank and Barnet branches, which had been
planned to start next Monday with the last trains using these sections
of the Northern line at around 21:30.

TfL acquired the shares of Tube Lines on 27 June, and has been working
to understand the status of the upgrade programme.

In light of this review, TfL has decided to cancel the scheduled early
evening closures originally proposed by Tube Lines.

LU will, therefore, revert to running a normal Northern line service
from Monday 5 July.

* Significantly less disruption

TfL is continuing its examination of the status of the Northern line
upgrade programme, and will carry out a further urgent assessment of
the planned work and the closures that are needed to deliver it.

The objective will be to deliver the upgrade with significantly less
disruption and far fewer closures.

Mike Brown, Managing Director of London Underground, said: 'Following
the acquisition of Tube Lines, LU is working with Tube Lines to review
the upgrade and hence we are cancelling the immediate early evening
closures planned.

'We will now operate a full service on weekdays on all sections of the
Northern line.

* Improved reliability

'Our priority is now to lay out a programme that gets the job done to
a timetable that suits Londoners and with the minimum disruption to
our customers and businesses.'

TfL will be engaging fully with the business community and listening
to its views as the closure programme is reviewed in the interests of
London's passengers and businesses.

The vital upgrade work to replace the 40-year-old signalling system on
London's busiest Tube line will deliver faster journey times, improved
reliability and additional capacity to reduce the congestion
experienced by customers on the Northern line.
---/quote---

The early closures were planned to affect "Kennington to Camden Town
(via Bank) & East Finchley to High Barnet/Mill Hill East from
22:00hrs, Monday to Thursday nights" from Monday 5 July until Thursday
26 August, as per LU's (as yet unmodified) six month track closures
'look ahead' PDF he
http://www.tfl.gov.uk/assets/livetra...k-closures.pdf

OK, so now the "objective will be to deliver the upgrade with
significantly less disruption and far fewer closures" - does this also
mean the upgrade will be delivered rather slower than originally
planned, with TfL deriving cost savings from a more protracted
timetable (i.e. stretching the work out over a longer period)? If so,
is this all part of the (new) new deal, as it were? (i.e. investment
in the 'age of austerity')