Some form of Sharding

[Galdor-maelstrom (Galdor)]

There’s more than one reason that Blizzard is looking to shard the servers for launch, as I’ve been saying:

@Galdor-maelstrom

The nature of data transfer between client and server is multiplicative in nature and scales exponentially as more and more data has to be communicated.

Which was also stated by Ion in the BfA Q&A yesterday:

Live Developer Q&A with Ion Hazzikostas- January 24, 2019