Full patch notes are here

[Skeezix]

Surprised there is no comments on this little line in the patch notes.

Additional retainers can be purchased via Optional Services.

Players may purchase up to two additional retainers. The purchase of an additional retainer will apply to all characters on a single account. However, a single retainer cannot be shared between characters on a single service account.

If I read this correctly, doesn't this mean shared storage between multiple characters

Killing me Smalls.