I've found an interview on a german game site.

Some interesting stuff was told there.

The number of 4 million player shall be the number of people, that at least had a subscription at some point.

Actually there shall be 2 million active players.

The EU datacenter is still work in progress. There will be a downtime of 2 to 3 days for moving (or better copying) the existing state to the new servers.

Yoshida actually plays Bloodborne.