Tickets go on sale this week
'Blue Ice' is taken from the band's forthcoming album 'Optica'
Swedish rockers say it was a 'nerve wracking' show
Keyboardist forced to flee stage mid-set
Fans to receive preview track at UK tour dates
Lykke Li and Peter, Bjorn & John feature
The Swedes wrap up their US tour
They'll hit the road this autumn
SO