One feature that never made it to Toki Tori 2 on the Wii U eShop, even in its + update, is the level editor. Although shown in a crude form at press events as far back as August 2012, it's never made it into the final cut on Nintendo's platform.
Unfortunately it looks like the feature isn't coming anytime soon, as the studio's Martijn Reuvers has posted the following message when answering gamer questions on Miiverse.
At the moment we're working on a new game concept, so the Wii U level editor is unfortunately in the fridge.
Further on Reuvers expressed hope that the level editor would eventually come, so it's not entirely lost yet. The new concept, meanwhile, was shown off with a teaser image, below, also on Miiverse.
Posting the image on the Nintendo social network hopefully suggests that the Wii U will be a candidate for release. Time will tell.
Thanks to WiiLovePeace for the tip.