EDIT: This has been confirmed by the original uploader in the comments to be a new Hub commercial aired this morning. If anyone has a higher quality link I'll throw it up.
And by small, I mean really small. That frame up there is part of only one of two shots in this commercial that feature the ponies, the other one being Celestia. The IRC guys can't identify the source of this video. Anyone got any clues? It's definitely new animation.
The video has been uploaded to Youtube. You can find an embed for that after the break.