From someone who may not be trolling with his claim to have heard it:

Completely and utterly Burzum. Has more in common with Hvis Lyset Tar Oss and “Jesus Tod” from Filosofem than anything else (although there are elements from Det Som Engang Var). The production is immense. The intro involves some metallic clanging similar to the parts on Filosofem, but it is very short, and then the lesson in real black metal begins. If people thought the Beherit comeback was good… – Brokeback Island Black Metal Board

The album has already leaked to one insider private torrent tracker, and reviews will shortly be forthcoming across the intertard.