On May 10, 2017 going to starts the Tokyo Indie Fest in Japan. Rainy Frog will be there with three playable games. According to the company if you visit the Rainy Frog stage you can play with the Piczle Lines DX (Nintendo Switch), Plantera DX Edition (Nintendo Switch) and Dead House (Wii U and PlayStation 4).
The Piczle Lines DX will be available from 2017 Summer in the Japan eShop. The Plantera DX Edition will be available from this June and the Dead House release in this May too. Here you can watch the promotion videos: