Mypaint 1.2.0 has been released. PPAs for Ubuntu are up to date. Windows builds are
underwaySummary of changes:
New intuitive Inking tool for smooth strokes.
New Flood Fill tool.
Automated backups of your working docs, with recovery on startup.
Improved symmetry-setting and frame-setting modes.
New workspace UI: two sidebars, with dockable tabbed panels.
Smoother scrolling and panning.
New brush pack.
New brush and color history panel.
New layer trimming command in frame options.
Added layer groups.
New layer modes: several masking modes added.
Add display filters: greyscale, simulate dichromacy for trichromats.
New color wheel options: Red/Yellow/Blue, Red-Green/Blue-Yellow.
Uses dark theme variant by default.
Clearer icons, prettier freehand cursors.
Device prefs allow glitchy devices to be restricted.
Eraser mode no longer changes the size of the brush.
New vector layers, editable in an external app (Inkscape recommended).
New fallback layer types: non-PNG image, data.
More kinds of images now work as backgrounds.
Improved Windows support
Ported to GTK3.
Accelerator map editor has moved to preferences.
Many other bugfixes, translations, and code quality improvements.
I tend to use the git version, so I'm familiar with many of these already. Almost all of them are quite solid. I especially appreciate the 'edit in external app' functionality, for text and vectors. Not super keen on the flood fill tool -- the way it interacts with an infinite canvas can be surprising and aggravating. Inking tool is getting there , needs a bit more polish (simplification options, tweaking multiple points at once). Layer improvements are really good, particularly the different ways you can mask layers / groups.