With 5.6 the collections API has been entirely re-written. This brings some conceptual changes and a larger feature set to collections.
The main difference between the old and new implementation is that a user is no longer created for external shares. Instead, the share impersonates the owner of the collections when the assets are accessed via a sharing token (link or e-mail).
On top of that, it adds the following features
More sharing options
Link (External)
Groups (Internal)
Expiration The expiration date for all shares
Revoking a share
Overview of who it is shared with
It is no longer possible to remove of a shared collection collections from your collections page.
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Do note that old links to collection collections no longer works work after the update, even if the collection themselves has been migrated.
The collection migration script for 5.6:
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and for 5.8
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