I got a suitably enigmatic email from the only slightly bonkers Icelandic band Sigur RÃ³s. This led to a page which hosts a short video clip, and no further information at all. Hmm.
A bit of searching suggested that this is a trailer for a forthcoming live DVD. Cool. The video is embedded below, or if you can’t see it due to AdBlock, eddies in the space-time continuum, or other oddness, you can see it on the band’s site.