I just heard the new song titled 'The Grand Conjuration' from Opeth's upcoming album 'Ghost Reveries' and I was rather pleased with it. It's more in the vein of 'Still Life' or 'My Arms, Your Hearse' (in my opinion) than the later Opeth albums. The song is almost 10 minutes long and weighs in at a whopping 22 MB despite the so-so quality (it's a radio rip)
On the downside it's not as heavy as I hoped it would be, but I will definitely be buying the album which comes out in mid-August.
You can find it on metal-related torrent sites.