Today, SDK Paint Wii U v4 was released in North America, so the online gallery website has officially exited beta. The update for Europe / Oceania / South Africa will be submitted to Nintendo tonight.
Once the dust settles on all of that, the iPad version will receive and update for the iPhone 6 and 6 Plus (and their younger siblings), so we should see additional growth there.
Show this newest component of the community some love at https://gallery.sdkpaint.com (also works with http)! You can leave comments and vote on art. Overlords can also delete inappropriate content.