I use the view "Taxonomy term" that emulates the Drupal core's handling of taxonomy/term.
I want to display a term image and a term description for each term of "Brand" vocabulary.
Using "Rendered entity" in Views Header I can specify only an exact Entity ID.
It would be nice if you could put %1 or %2 into Entity ID to get the name or ID from URL (or rather - from contextual filters).
For now I can only use static Entity IDs and get only a single entity in header: http://puu.sh/2r1V1