In message , at 16:13:48 on Fri, 7 Dec
2007, Paul Scott remarked:
the main concourse is at ground level, and the main entry/exit
from the platforms will still be directly from the existing front of the
station, towards the new square, and also via the western side concourse,
which will clearly provide much improved access to the underground. There
will also be a mezzanine level for cafes & shops etc.

Unfortunately there isn't a small size report I can link to, but its all on
the Camden site if you slog through it...

I'm sure that last time I looked the platform ends were going to be
*only* exits [1]. I printed it out when this last came up, but that's at
home 300 miles away. Later this weekend, maybe...

[1] There was discussion about how they'd likely get very congested in
the rain because people would stop to put up umbrellas etc, rather than
striding outdoors into the wet.
--
Roland Perry