How to join Casual 16?

[KnutValentine]

Casual 16 isn't listed in the list of available worlds. So how do I join casual 16?
When I was going to transfer my village in world 139 the only casual world I could transfer to was casual 15.

Is joining casual 16 only possible by transfer from world 140?

 

[Nova]

Yes, you can, as announced, currently only join Casual 16 by transferring from W140.