King Ultramega's revolving lineup features members of Alice in Chains, Mastodon, Metal Allegiance, and Anthrax and Pantera for its debut release.
Cameron first joined Pearl Jam in 1998, following the initial dissolution of Soundgarden the year prior.
"Just hearing Chris’ voice helps, I know he did that for everyone he knew," Shepherd wrote on the eighth anniversary of Cornell's passing.
Chris Cornell's widow, Vicky, has hinted that "there's more to come".
