Found this on a transport blog:

'Reports are that during 2011 the Sevenoaks service will return to
Southeastern with First Capital Connect running a new Tonbridge via
Bromley South, Orpington, Sevenoaks and Hildenborough service. First
Capital Connect will also run a service from London Bridge to Dartford
calling at St Johns and then split with all station services via both
Lewisham/Welling and Sidcup/Crayford lines.'

'Maps have already been given out to developers in the City although
it carries the disclaimer “This map shows a indicative route network.
The 2011 Thameslink train service is subject to further evaluation and
consultation by the DfT, including an assessment of the levels of
train service at and through London Bridge during the construction
phase of the station”.'

URL: http://tinyurl.com/cwyw5l (check out the big paragraph in the
middle)