Fact
A leaked Blizzard player survey (reported by Icy Veins on Oct 1) asks about 11 possible classes for Forever: Monk, Death Knight, Demon Hunter, Illusionist, San'layn, Necromancer, Rune Knight, Warden, Witch, Bard and Tinker. Nothing has been announced; surveys test interest only.
Confidence note
Rumor (leaked survey; not announced)