Battle for Dream Island was delayed for 3 years. In-between that time, many future hints, trailers and updates for the episode in particular and the creators in general has been announced. This page will cover most of that up.
It was confirmed that Cary and Michael have both returned to the community as of March 2015. Cary finished Algicosathlon, started The Amazing Marble Race Season 3, and is actively posting new TWoW videos on his channel; Michael on the other hand is actively responding to tweets and posting videos on Zack Bone Productions. Cary states in the video "Bring BFDI 1 Part 2 Back", that BFDIA is not dead, but he and Michael have been constantly thinking about how to revive it.
On March 3, 2016, Michael created and uploaded a video named "Why We've Had to Stop Animating on YouTube ". It explained that their AdSense account was terminated for unknown reasons on March 6, 2014, destroying their profit income; the end result was that they could not continue BFDIA anymore. Michael did state that they don't just make videos because of the money, it was for everyone to enjoy. However, without money being earned to make a living, BFDIA could not continue at that point.
On May 7, 2016, Michael revealed on a livestream that BFDIA 6's basis is about Yoyleberries and the secrets of BFDI, and he said that he and Cary are aiming to release it in summer 2016. This was confirmed by a reply on Twitter that he sent out on May 10.
On June 14, 2016, Michael and Cary revealed on Twitter that their AdSense account was unbanned, allowing them to receive profits from videos again. They released a slideshow speculating the possible cause of the original AdSense termination the same day. This virtually guarantees that BFDIA 6 will be released.
On July 10, 2016, Michael tweeted a countdown timer for the next episode of BFDIA, showing the amount of days (which were hidden), hours, minutes, seconds and milliseconds until the next episode. The amount of days was likely left out on purpose. The countdown timer can now be found here.
On July 21, 2016, Michael said in a tweet that there will be an 80-second BFDIA animation made as an announcement video coming on Saturday morning (July 23, 2016).
On July 23, 2016, the animation (named BFDI Is Back) was released, implying that BFDIA 6 is releasing on September 1, 2016 at 8AM PDT. And "the book" says the slug is coming on that date, so possibly the title of the episode is "The Slug."
On August 23, 2016, a video was uploaded that included unused BFDIA 6 scenes. It seems that the plot of these deleted scenes them staying and living in Yoyleland. We also hear new voices for the characters. Gelatin's OMG moment is also heard as "Oh my Collagen".
On August 30, 2016, a video named "Coming Thursday" was uploaded to JacknJellify's channel, the video starts with an audio clip from the first BFDIA 6 deleted scene while looking at the timer for the Wikia Battle of Foods, another audio clip plays where a metal version of Firey's announcer is dropped into the water, Pin then asks if it is the original announcer Firey's announcer then impersonates the original announcer. Ruby then tells Pin that she gave Firey's announcer a yoyleberry, and Pin then asks if she can get her limbs back and the Announcer says that it would be cheating. The video then ends.
On September 1, 2016, Welcome Back, the first episode of IDFB, was released.