Club Penguin Island/Pre-beta

Beginning in June 2015, Club Penguin began releasing sneak peaks for the project that would eventually be known as Club Penguin Island. At the time, it was referenced almost universally as Project Super Secret.

Clothing Customizer
The Clothing Customizer is a part of Club Penguin Island that was first partly revealed on June 29, 2015 on the fan blog, Club Penguin Space. On July 3, 2015, it was revealed by Club Penguin in a video. Unlike the Custom Hoodies, players will be able to change the color of a hoodie in three areas, add one of many patterns, add a decal, and alter its size.

On March 11, 2016 with the post "Project: Super Secret Update!", Megg posted a video showing the close-to final version of the Clothing Customizer.

On October 26, 2016, the post "Project: Super Secret - October Update" showed an almost finished version of the Clothing Customizer, with more costumes and clothes combinations.

Express Yourself
On August 21, 2015, Megg teased another part of Club Penguin Island in a blog post called "Express Yourself". The post showed a test video of actions penguins could use to express their feelings.

Welcome
On November 27, 2015, Megg teased another part of Club Penguin Island in a blog post called "Project: Super Secret... Welcome!". The post showed the concept of a welcome area where new penguins are welcomed into the community.

Renovated Island
On December 22, 2015, Spike Hike posted a sneak peek of the new renovated Club Penguin Island alongside the new Migrator on Twitter, with a caption underneath saying: "Hey this looks familiar, yet different. Are we in a different dimension?" It also shows part of the new Welcome area, the Beach, and a tall building in the back.

Fun Hut
On January 29, 2016, Megg posted a sneak peek of the Fun Hut with the post "Project: Super Secret - Fun Hut!". The post showed the concept art for the hut.

Disney Mix
On February 24, 2016 with the post "Calling All Penguins in Australia and New Zealand!", Spike Hike posted a sneak peek of Disney Mix, a social messaging app that was released on February 25, 2016 for iOS and Android. The app contains a range of Disney content as well as a free and safe way to chat.

On February 26, 2016 with the post "Puffle Emotes?! Disney Mix Now Available in Australia and New Zealand", Megg posted a video about the app being available and in the comments she talked about how Club Penguin Island is more than just Club Penguin and that the app just incorporates a bit of the game.

On July 21, 2016 with the post "Disney Mix, Coming Soon", Megg announced that the app will be available to more countries very soon.

On August 4, 2016, the app was officially released.

Meet the Band
On April 29, 2016, Megg posted a sneak peek showing how players will be able to wear clothing while playing musical instruments. The video contained a sneak peek of a room as well as some features such as quick chat, emojis, and actions.

Customizable Clothing Templates
On May 30, 2016, Spike Hike posted a sneak peek of his penguin in 3D and a sneak peek of a feature icon that will be posted next month, described as "a new take on serving hot chocolate and coffee on the island". The post is a poll as well, asking the community about what customizable items they want to see.

Pizza by the Slice
On June 30, 2016, Megg posted a sneak peek of a new feature that will allow penguins to eat pizza, instead of the new feature described as "a new way to serve coffee to your friends", announced by Spike Hike one month before. The reason behind this change of plans is unknown.

Happy World Emoji Day
On July 18, 2016, Megg teased new emojis for the upcoming Club Penguin Island. When asked in the comments section if they are part of the Disney Mix, Megg answered: "Maybe both?! Only time will tell ;)".

Dive Right In
On August 31, 2016, Megg posted a few concepts of marine life and a sneak peek of a future underwater room.

Waddling On
On September 7, 2016, Spike Hike announced his departure from Disney and consequently Club Penguin. As his last sneak peek, he posted a video featuring new actions, consumable items, the underwater room and how penguins will interact with the environment.

The First Penguin Artists
On September 30, 2016, Megg posted a few cave paintings of past residents of the island, and another sneak peek of the unknown submarine room present in previous blog posts.

Island Insider: Official Episode 1
On October 6, 2016, the first episode of the web series Island Insider was released. At 03:10, Megg can be seen holding a sketch of a building and a fragment of the Lighthouse.

October Update
On October 26, 2016, a sneak peek video showing the near finished game was released, along with a list of the completed stages of the development so far:
 * Official name
 * Updated chat system
 * Adventures for long lost treasures
 * Pyrotechnic stage
 * Hundreds of collectible sea crystals, seaweed and more
 * 120+ daily challenges
 * 160+ clothing item blueprints
 * 20+ party supplies
 * 400 crates of confetti
 * 250+ penguin animations
 * 75+ emotes
 * 500+ lines of voiced dialog
 * And much, much more!