I have considered to go there too, but there are only Opeth, Porcupine Tree, Soilwork and Insomnium attracting me. Maybe Finntroll / Amorphis in the club. But thats far too few for even travelling to a festival near me
If I understood right, there will be a streaming video thing in the Ilosaarirock homepage and they will show three first songs from every band that plays in main stage and Opeth plays there.
I got my pal to record the webstream, but just now I learned that only three first songs from each main stage performer will be shown... Oh well, I hope everything works as planned, and I get to see the new line-up.