I know there is a Plasma 5 widget section http://kde-look.org/index.php?xcontentmode=93 though I can't remember where or how I found it, just know I read it somewhere and saved the link. But there should be sections specific to Plasma 5 (plasmoid and themes) both on the sections listing on the home page and in types on the "search content" page.

Searching there for plasma5 gives me an additional widget and a theme http://kde-look.org/content/search.php, also there's another widget/app on kde-apps.org http://kde-apps.org/content/show.php/Di ... ent=168881 (this does show in ghns)

And related is the issue that in "add widget" the ghns tends to mostly be themes with an icon and at least 1 app (Nootka guessing because it's qt5)