There's a short press release here
(in swedish) with a rendered picture in it.
The press release doesn't say much except that it will be located in "the middle of Lisebergbanan" and it will open when the park opens on 28th april 2007. Judging from the picture it will be located on the mountain side in the middle of Lisebergbanans three helixes. The green thingies in foreground and in the background represents Lisbergbanans track.
I was hoping for another coaster, but I guess they don't have the space for that yet
EDIT: It's the 32-person model