This is a great callback to Ra-den's two fights as he uses "Vitae" in both of them as his lightning powers. Looks like this confirms it was Life/creation juice all along.
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Because the islands can be around EK/Kalimdor like the zones in Cata? Or they would be their own thing while a revamp still happens. I distinctly remember people disliking the disconnect in the Cata endgame zones (even if they were made in the old world) so if they made one continent for endgame it would explain that.
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Same twitter person mentions the following NPCs are also included in the 9.2 files.
Nice to see Voss. Baine has an actual story. Alleria is absent because she will be spammed all over next expansion, but she should be here.Calia
Baine
Darion
Genn
Shandris
Tyrande
Renathal
Voss
Maiev
Vereesa