Amazon has confirmed which worlds will be merging within New World servers in US-East, US-West, Australia, and Central Europe.
Community manager Luxendra advises that there will be “two separate times listed for these merges”, “one for preparation and one for execution”.
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Dozens and dozens of worlds are affected – enough that I can’t list them all here – but you can check the changes for your region on the official forum.
“As a reminder, once in-game messaging is posted, players in these worlds will not be able to transfer servers,” the post explains. “They will see a banner at the bottom of their screen reminding them of this merge when they enter the game.”