Adding a couple of the above to the list. Also adding TEMPERANCE, as one of their singers is now the new male lead singer for Visions of Atlantis.
RED = ruled out
Ruled out Amorphis. Added Solstafir and Wintersun
Amorphis - they love the cruise
(Ruled out - touring)
Angra - because, Fabio
Annihilator - seem to do it practically every other year
Beast in Black - gap in their tour and new album out soon
Borknagar - everyone expected them to be on in 2018
Dragony - lead singer on as a cruiser in 2018, bassist will already be on with VoA
Ensiferum - due for a return
Evenmore - singer was on board in 2018
Ex Libris - lead singer posted on Facebook that she'd love to return
Ne Obliviscaris - because, NeO
Moonspell - due for a return
Mors Principium Est - because, Phoenix
:)
Overkill - seem to do it practically every other year
Persefone - because, Persefone
Rage of Light - singer was on board in 2018
Scour - due to the bikini facebook ad prior to 2018 cruise
Solstafir - many sources saying so
Temperance - One of their singers is the new male lead in VoA
Thaurorod - band members on as regular cruisers in 2018
Therion - they love boat
Trollfest - gap in tour dates
Uli Jon Roth - told a cruiser in 2017 that he was a lock for 2019
Unleash the Archers - really want to be on
Visions of Atlantis - male singer on as a cruiser in 2018
Vital Remains - lead singer on as a cruiser in 2018
Wintersun - band members say "we'll see"
Zimmer's Hole - reuniting