Hey Jeff,
You define the values for the picklists in the modal that controls visibility rules.
Here's what it looks like today:

This is accessed through the "Visibility Rules" option under behavior in the right panel of the field details page.
From this screen, you will individually select the values you would like to have loaded for the specific picklist you are defining.
When you're running through this, please make sure to de-select the "Select All" option by clicking the "x" on the bubble.
To make this process faster, for the February release, we've updated the picklist selector to be consistent with our advanced values editor... like so:
(Advanced values editor)

(Feb. Visibility Rules editor)
Hope this helps!
Thanks,
Jason