When Selecting Content via Taxonomy within a Build Widget, you are now able to select multiple sites and contentTypes. ContentTypes will be displayed when the given site is added to the sites list. It is assumed that no selections is the same as having everything selected, and selections will narrow the results.

In the Above Example, we are pulling content tagged to Big G Topics -> Automation. Due to my sites/contentType selections, this will pull Articles and Press Releases from AM, Articles for MMS, and any content for PM.