The new expansion is called Evercold

[Jeeqbit]

Whilst this was my initial reaction as well, upon reflection, it doesn't make sense. We already know what happens when the shards join with the source, and it isn't good.

Well yes, but it seems like part of the Ninth was merged without issue, in a way the Ascians did not seem aware of.

Despite that we are apparently joining the shards together, the expansion does not give me the impression that we are doing this, because it seems the focus is entirely on the Fourth. This may be why they called it a "Saga". We may be doing it gradually over multiple expansions and patches.