Transformers: Legends “Battle of the Brothers” Begins, Featuring Unicron and Primus

DeNA, developer of the Transformers: Legends game, has posted on their updates and announcements page that the next game event has begun.  “Battle of the Brothers” features Unicron and Primus dueling it out in the prehistory of the Transformers universe.  Read on for links and the full story teaser.
The Battle of the Brothers announcement page, which features the following description:

The AUTOBOTS and DECEPTICONS are locked in fierce battle over an experimental space bridge designed by JETFIRE. GALVATRON, intent on using it to transport weapons of mass destruction straight into enemy territory, orders his forces to use any means to secure it.
A stray shot from someone’s weapon strikes the space bridge, causing it to overload and explode. RODIMUS, JETFIRE, and GALVATRON and their teams are blown backwards through time, to before the creation of Cybertron.
There they discover the two brothers, PRIMUS and UNICRON, locked in titanic combat. The universe trembles with each blow, until finally the both withdraw, summoning forces to their sides to aid in the battle.
GALVATRON, in his madness, decides to ally his DECEPTICONS with UNICRON, ignoring the fact that the destruction of PRIMUS will spell his end as well. Meanwhile, RODIMUS, JETFIRE and the AUTOBOTS, realizing the stakes, throw all of their strength behind the creator of the Cybertronians.
Will PRIMUS prevail over his brother, the Chaos Bringer? Or will UNICRON finish the creator and erase the AUTOBOTS and DECEPTICONS from existence? Find out in TRANSFORMERS Legends – “Battle of the Brothers”!

Battle of the Brothers Poster