Alias: Tanken Driland
Driland is an anime that is based on a mobile game that was created by a company Gree. The anime is produced by Toei Animation and directed by Toshinori Fukuzawa.
Due to the influence of someone who visited her town when she was a child, Princess Mikoto of Elvo decides to become a hunter and search for treasure all over the land of Driland. She sets out on her journey with her personal assistant Wallens, but they are soon joined by Pollen, a hunter who dreams of being a hero, and Paan, a wondering knight. As they continue their exploration they begin to sense great danger drawing near.
Crunchyroll poster - I might have mispelled some names.
For more summer anime trailers, please check out the Summer Anime 2012 Video Anthology blog.