Woot, I just found them on the preorder tab on the season 8 scenario page
Looks like a 3 part 1-5.1-5.3-7 set on the Plane of Air
and a 2 part 5-9 set on the plane of fire.
Leaves another mystery scenario to come out in January.
Speculation to follow: (Please avoid spoilers as much as possible.
Can we look forward to multipart scenarios on the plane of earth and water later?
Earth seems the easiest to play around with in tier 1-5 and the scenario set there earlier this season opens doors for future adventure.
Water is of course a little trickier, I would expect a 5-9 just like air.
Although that would make a lot of linked scenarios this season, maybe we'll just see another few set on the elemental planes?