Which Multiverse worlds can I visit?

Three worlds are announced, at different stages:

• Dayroot — the near-future hub of the Multiverse, and the one that is open. Administrative and social life centres here, and land inside it can be owned.
• Dawnglow — a casual, cartoon-styled world. Marked Coming Soon.
• Nightlore — a medieval fantasy realm of magic and arcane research. Marked Coming Soon.

The Multiverse page shows each one, and a world without a date on that page does not have one anywhere else either.