Tribal Island

Tribal Island is an Island set to release on August 6, 2015. It will be part of update 1.3.6 and may have something to do with feeding monsters over Level 15 according to pictures.

About Tribal Island
There appears to be no castle on this island. Monsters appear to be sitting on leaf like bases. It's currently unknown on how to get monsters onto Tribal Island. The unknown female volcano monster sits on top of a stump at the top of the island. At the top of the island there are various coloured feathers sticking out and dinosaur-like bones.

Monsters
The following monsters can be seen in BBB's promotional video:
 * Mammott
 * Tweedle
 * Furcorn
 * Oaktopus
 * Fwog
 * Maw
 * Shrubb
 * Pango
 * Thumpies
 * Spunge
 * PomPom
 * Clamble
 * Entbrat
 * Unknown Volcano Monster

Teasers

 * Since the appearance of the Rare Mammott, BBB has been posting letters on social media and in-game news, as hints. We have "Tribal Fire"so far.
 * On July 21st, BBB posted a video on their vine with the woman that voices the Pompom singing "C'mon let's go".
 * On the in-game News flier for the Rare Potbelly, an odd monster was shown on the right side. Tribal_Island_Logo!Image.jpg
 * A few days ago, BBB posted a video on their YT about Diane's trip to BBB, which had a image of a new Monster.OMG!Image.jpg
 * On July 24th, BBB posted another video on their vine with a man singing a song similar to Furcorn.
 * On July 27th, an in-game loading screen message read "Join together with your friends to create a Tribe, to discover an ancient secret about the Monster World on Tribal Island."
 * On July 28th, BBB posted another vine with a woman singing similar to Maw, and confirmed that an announcement will be arriving "later this week".
 * Also on July 28th, a post that included a secret message between 2 Tweedles appeared.It said "Hey! The monster handlers are working on something. Tell everyone." The other Tweedle responded "OK! I'll tell them!" The game will be going into maintenance starting at 2 AM ET for several hours.
 * On July 29th, BBB posted a teaser image for the Rare Noggin.
 * On July 31, BBB posted a trailer for Tribal Island on Youtube, Facebook and Twitter that showed the new monster singing. The trailer can be seen here.
 * On August 5, BBB posted the Last letter of the teaser. The word is now Tribal Fire. They also confirmed the update would arrive the next day, August 6.