1.0.0.4 includes a variety of tuning changes in addition to what was previewed.
The Crucible, whatever it mysteriously might be, is not the expansion, which remains unannounced.
If you read Mornay’s dialogue, he mentions a fortress of salt rock (aka a salt mine)…content that didn’t ultimately make the cut.
It’s actually a new format of microtransactions called macrotransactions, where you buy access to a microtransaction store.