According to a guild mate, the invite only testing for the next 20 man Raid has started and it has 9 bosses. Looks like all the speculation is correct and we should see it in 1.7 near the end of the world event.
Muffinman- Rift, Legacy guild, Keenblade server, 5/5gsb, 4/4RoS, 4/4GP, 4/4DH, 11/11HK, 0/8 ID
Muffinmans- Aion, Vis Pator legion, Zikel
Daslayer- World of warcraft, Froget my guild, 7/7? dragon soul (LFR) Pro, I know