My understanding:
- the new skirmish is an alternate version of rala and cirdas skirmish, its not a new area skirmish. Its called Alluvion Skirmish, that will demand torso and legs
- the content, aparently, is something similar to nyzul. You are given objectives, and once cleared, you hit the "living cairns" to be teleported to other area with, suposedelly, new objective. The objectives varies from killing an amount of enemies and killing specific nm. In the end, there is a "leader", that upon defeat, you receive the rewards.
- rewards: new weapons and shields, that can be augmented by arcane glypts, plus obsidian frag and a new material that drop from alluvion skirmish and that can reduce the random component of augment process. Aparently, if you use a specific material, you restrain one kind of augment, and stones just will /random the amunt of stats.