I thought that would be fairly easy: I am working with Panopoly and I have multiple Landing Pages, a Vocabulary, Content Items and a View with a Content Pane.
The user can select one term per Landing Page (term reference) on creating the lp. Also the content items have one of the terms from the vocabulary attached (as well via term reference).
The View lists all the content items with a contextual filter by term. By default the content pane is part of a newly created Landing Page. So, in this simple case, I want the user to pick a term from the vocabulary and subsequently let the content tagged with this term appear on that landing page via the content pane.
What I get working is the contextual filter "Has taxonomy term ID" with "Argument Input: Input on pane config" Now I can pick a term through the IPE.
However for more complex applications I would like to hand the term selected by the user on creation of the Landing Page (in the edit form) to the content pane, so that the user doesn't have to set it on each content pane seperatly.