Idea: A image-editor with a git-like history, UE4-like blueprints as layers, built-in scripting, dockable viewports, infinite canvas (zoom&pan), raster- & vector-graphics capable... and all of that completely hardware accellerated!
Subimages and annotations that can be exported as, say, JSON... then it could even be used as a simple 2D map editor.
Another thing I miss in image editors: Free Guidelines. Not just a plain old quadratic/isometric grid, but arbitrary patterns of lines that can be put above/below image-layers. Useful for perspective drawing.
The ability to freely translate, rotate, scale and skew the canvas one is drawing on would also be handy now and then...
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