Activision released a statement from their Q4 2016 report. For Skylanders, a new mobile game is in development, but no new console game is planned for 2017. New Skylanders: Imaginators content will be released for 2017 instead.
"In 2017, rather than releasing a new console title, we will be supporting the award winning Skylanders Imaginators with multiple adventure packs, new characters and new in-game content. We are also excited to bring Skylanders Imaginators to Nintendo Switch as a launch title next month and we have a new Skylanders mobile game in development."
"The Skylanders franchise will not have a full game console release this year, but we will continue to engage the community and drive player investment through new toys and digital content."