Opeth mainman Mikael Åkerfeldt has reportedly starting work on new material. The band tentatively plans to enter the studio in spring next year to begin recording. In other news, Mikael recently visited No Man Studios in Hemel Hampstead, UK to lay down some guest tracks on the upcoming Porcupine Tree album. He plays guitar on one song and sings backups on five. It's expected to be released later on this year.