Scope of @angular/cdk: will overlays be added? a11y?

[dherges]

Bug, feature request, or proposal:

Proposal / Question

What is the expected behavior?

What is the scope of the cdk?

What is the current behavior?

CDK works fine!

My question is: what is the scope of the CDK?

In special: will the overlays from core be added to the CDK?

Also on a11y: there seems to be some overlap between core a11y and cdk a11y

What is the use-case or motivation for changing an existing behavior?

I am asking because some of the features in core seem so generic that they can be shared and re-used through CDK.

What are the steps to reproduce?

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Is there anything else we should know?

[jelbourn]

See #6100

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