The official website began streaming the first promotional video for the upcoming second season of Aldnoah.Zero on Sunday. The first promotional video gives us a preview of the opening theme song &Z by SawanoHiroyuki[nZk]:mizuki.

Aldnoah.Zero 2nd Season will return in January and air during the Winter 2014/2015 anime season.

http://www.dailymotion.com/video/x2dian9

Two commercials were also subtitled and streamed by Aniplex earlier:

A new visual was also revealed on the website:

Forth-Aldnoah.Zero-2nd-Season-Visual-Officially-Released-haruhichan.com-Aldnoah.Zero-4-visual

Past visuals:

Third Aldnoah.Zero 2nd Season Visual Officially Released haruhichan.com Aldnoah.Zero 3 Second Aldnoah.Zero 2nd Season TV Commercial StreamedSecond Aldnoah.Zero 2nd Season Visual Officially Released haruhichan.com Aldnoah.Zero 2 Second Aldnoah.Zero 2nd Season TV Commercial StreamedAldnoah.Zero Season 2 Visual 01 Haruhichan.com  Second Aldnoah.Zero 2nd Season TV Commercial Streamed

Aldnoah.Zero is a brand new original series created by Gen Urobuchi, the writer of the Fate/Zero light novels and anime, and Mahou Shoujo Madoka★Magica. The anime is directed by Ei Aoki who directed the Fate/Zero anime – teaming up with Urobuchi once again. The series is written by the “Olympus Knights”, a group of writers from Nitro+ (known for their science adventure visual novels) that is helmed by Urobuchi. Katsuhiko Takayama (Mirai Nikki) is the series composer, managing the flow and story of the series.

The character concepts are done by Masako Matsumoto (Naruto Shippuden) and the final character designs from Takako Shimura (Aoi Hana). The series features mechs designed by I-IV and Kenji Teraoka (Ghost in the Shell: Stand Alone Complex), and the music is composed by Hiroyuki Sawano (Attack on Titan). The series is produced by A-1 Pictures (Sword Art Online, Fairy Tail) and studio TROYCA (new studio opened by Aoki). The first series had a total of 12 episodes and was earlier confirmed to be a split cour.

Aldnoah.Zero synopsis from Haruhichan:

In 1972, the Apollo 17 mission found a hypergate to Mars on the surface of the moon. Upon landing, astronauts discovered a enchanted utility later referred to as ‘Aldnoah’, giving the astronauts a status of superiority. Soon, many humans have relocated to Mars, and have adapted to the name ‘Martians’. After Princess Asseylum, a royal Martian princess, descends onto Earth in an attempt to create a treaty between both planets, a war breaks out between Earth and Mars, and Martian soldiers begin to descend from the sky, riding steel giants, intent on exterminating humanity.

Source: Aldnoah.Zero Website