Opeth are often credited to be among the masterminds behind progressive metal, and despite the fact that they haven’t achieved commercial success, the Swedish metalers are still among the titans of the genre. Now, they are proud to announce Watershed as the title of their forthcoming album, which is set for June 3rd, 2008.The band was recorded in Swedish homelands and was produced by frontman/guitarist Mikael Akerfeldt and Jens Bogren; it promises to be a…