Relation to "one of these databases"

[Matt_Blais]

Not now, but hopefully someday

Polymorphic relations. When creating relation, ability to have many Types from which to choose, and not just one Type

It appeared we need Polymorphic relations for References 2.0 features. So there is a chance that we will add them this year. However, with some limitations (like up to 5 databases on every end).