Heavensward Ending (Spoiler)

[Allyrion]

The Archbishop used the term Heavenwards when calling down Azys Lla, which seems to be a space station before.

They used it similarly at least one more time. I'm getting the impression Heavenward as a theme might not just mean north (Ishgard region), but even further.
Beyond Hydaelyn.

Might be part of the climax that go to space!

Hum what does Matoya says exactly in english ? In french she says that it drains her life force to see throught the aether.

She pretty much says exactly that. That she's losing her life force seeing through the aether.