OAuth: Allow multiple tokens for a single application id

Description
There are a number of discussions about upcoming improvements/changes to the OAuth process to allow for a single OAuth application to have multiple refresh/access token combinations.

ie. Granting more than 1 refresh token per user / client ID - #3 by Jared_Morse

Is there any update on timeline for this feature to be released?

Thanks in advance for any additional clarity you can provide.