(Dengekionline) Preview for patch 3.2.

[Alahra]

So...I mean WHM is confirmed Shiva now right?

The translation of the Japanese (linked in the second posts) specifies that the Shiva set is Casting, which Google Translate confirms.

Edit to add an additional thought:

Actually, the fact that it's the Hailstorm Attire of Casting all but confirms the sets are in fact role-based and not job-based, as Casting has always referred to both BLM and SMN gear so far. It's possible they could be changing that (honestly, I never really understood why the ranged DPS have shared sets and the melee DPS don't), but I wouldn't bet on it. We probably wouldn't see a change like that outside of an expansion launch.