John Gruber dug into this article from the Hong Kong Free Press:

The US-based global tech giant Apple Inc. is set to hand over the operation of its iCloud data center in mainland China to a local corporation called Guizhou-Cloud Big Data (GCBD) by February 28, 2018.

You can read Gruber’s take here.

As a postscript, Gruber links to this Apple knowledge-base article, which lays out the encryption methods used to protect the various data types stored in iCloud.

I found all three of these definitely worth a look.