Ok, made a few phone calls real quick and got following info for us.
The Nurburgring calendar that shows the open track days will be available aprox begin of january 2009!
Also there will be Formula 1 at the Ring from 10th to 12th july! (Nordschleife might still be open then as different part of track this.)
Regarding the prices, there will defo be a single lap ticket too in 2009!
Prices are:
1 lap = 22 Euro
4 laps = 75 Euro
8 laps = 145 Euro
15 laps = 250 Euro
25 laps = 390 Euro
Hope this helps!