Sofia the First Pilot?

Another screenshot, taken from a Cartoon Brew article.



This is a more finalised version, but the poses are similar to the ones on the Hong Kong promo.

Some concept art, including the origin of the early Sofia princess design.

This was before I even made this thread! But anyways, they did mention the pilot.

While I normally take tvtrope's trivia pages with a grain of salt (ever since seeing a """fact""" about toad from mario that wasn't true), this does seem to line up with the name of the show in the concept art you've found.