Yoshi P confirmed they CUT ultimate content from 6.0 not DELAY

[Vickii]

I am soooooo excited about Island Sanctuary I'll be pre-ordering for that alone (YAY)

But hopefully SE will also get 2 quality ultimates out. It's good to have a nice balance of content

I think the sanctuary will be a big part of the expansion for a lot of players.

Ultimates... honestly I guess if it doesn’t take up too much development time it doesn’t really hurt, but it’s nowhere near as important as most content in the game.

As I said before the only people who do it are a small number of raiding statics and people who literally pay for clears. Removing this content would actually help fight RMT and it’s not like too many people would miss it.