The Bubble Gum Gang series does not have a new book coming out soon. The latest book, Warning: Baby-Sitting May Be Hazardous to Your Health (Book 3), was published in February 1993.
The first book in the Bubble Gum Gang series, There's No Such Thing as a Haunted House, was published in October 1991.
The Bubble Gum Gang series primarily falls into the Mystery genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.