There will be multiple lectures on a broad range of security topics as well as several hours per day where the students will be hacking and researching "offensive information warefare".
The course itself is free, but you have to pay and organize your hotel etc. yourself.
The FAQ, the homepage from last year's summerschool and the paper "An Offensive Approach to Teaching Information Security" (PDF) by the organizers provide more information.
I'd like to go, but I'm not sure whether I will find some hotel which is cheap enough for a poor student like me ;-) We'll see.
(via disLEXia 3000)