This is the current lineup of Adobe Creative Cloud mobile apps. New to the service are Adobe Capture CC, which consolidates Brush, Shape, Color and Hue into a single app and Photoshop Fix, a retouching app.
Here's the roster of now-discontinued apps. Ideas died a while back, PS Touch has been replaced by Photoshop Fix and Adobe Line's features have been sucked into Adobe Photsohop Sketch and Adobe Illustrator Draw. The four remaining apps now constitute Adobe Capture CC, the overarching mission of which is to intake the world through the camera and make it accessible to CC apps and applications.
Shape is one of my favorites of the tools; it takes any image and traces it into a vector graphic. It's a bit tricky to get a shot that will deliver the results you want, though, and the resulting graphics can be very complex and hard to edit in Illustrator. Nevertheless, it's great for FPO graphics, inspiration or contributing to design projects when you lack drawing skills.
You can edit many of the brush characteristics, including how it behaves at the ends or the middle of the stroke. My only complaint about Brush is that you have to generate brushes for each application individually.
Here you can see the new blend modes. From top to bottom, the top strokes use combine, normal and blend. The bottom layers were created with the new watercolor brush, which simulates bleeding into the paper. You tab a fan icon to stop the bleeding.
Although Photoshop Express is a more consumer-oriented app, with similar tools to Photoshop Fix but also special effects and automatic tuning, Adobe has increased its integration with the other mobile apps. When you're done with the operations in the other app, you tap the bar at the top of the screen and it sends it back to Express.
Adobe continues to increase the consistency of the interface for its mobile apps. The only difference between these Photoshop Express and Premiere Clip screens is the types of Looks available in the apps.