Reposted from Miiverse, concerning the free upgrade coming to SDK Paint...
While SDK Paint was waiting in the review queue, we had an opportunity to submit several updates that were originally planned for the late January update, but they will be making it into the December one, after all.
(Note that this version will be coming to Europe in Q1 2015.)
Here is the final change log of what you will see next month:
--Painting Screen-- *Grids & Guidelines directly integrated into the toolbar (and removed from Stencils)
*Increased save slots from 10 to 18
*Color Palette - Doubled in size, drag support, more grays
*Screen Mirroring - Plus/minus buttons to change TV display
*Tooltips - hold stylus on icons to show tool name
*Brush Tool - pop-up menu with 18 brush sizes
*Camera Tool - snap photos to the reference layer
*Drag Tool - drag stylus over canvas to move it
*Flood Fill Tool - new procedural and zoomable patterns
*Layer Clear Tool - immediately erase a whole layer
*Layer Swap Tool - swap the active layer with another layer
*Smudge Tool - drag stylus over artwork to smear
*Spray Tool - drag over stylus to spray paint
*Undo Tool - 10 steps, number on icon to show remaining
*Zoom Tool - 4x magnified canvas area (with support for straight lines)
--Galleries-- *Improved framerate
*Flip display
*Motion blur mode
*Doubled size of all galleries
--Sharing-- *Gamepad preview of artwork modifications