We can't be 100% sure about future courses until we've engaged the community, and validated the market with a successful Kickstarter. That said, here's some things we're actively researching...
+ UNITY PRO: Covering advanced topics like team collaboration, performance, etc.
+ UNREAL: Now that Unreal Engine is free, we may make a course on that.
+ GIMP: 2D textures and pixel art made easy in this free and powerful tool.
+ DAW: Digital Audio Workstation. Make all your own sound & music.
+ AI & PATHFINDING: Exploring Artificial Intelligence programming.
I hope that helps, remember we also create mini courses like our existing Game Physics and Procedural Generation courses.