We're fans of DuckTales: Remastered here at Nintendo Life, especially those of us old enough to have first-hand nostalgia for the NES original. Despite its strengths it isn't quite perfect, including the odd technical issue that'll require an update to patch over the cracks.
In the case of the Wii U version there are issues with the leaderboards, while community members have cited end-game freezes among others; Capcom Unity staffer JimmyRey has therefore confirmed that a patch is in the works. This update was actually given a week ago, which means the patching process will have hopefully made some progress.
I apologize for any inconvenience any of the issues you've run into might cause you. Unfortunately, QA is not an exact science. Having shipped many titles, I can tell you that there are some issues can only manifest themselves when being released out to the wild and you'll never see in QA, like the Wii U leaderboard issue. Some issues occur very rarely and we may see once or twice during QA, but never have reliable steps to recreate and fix the issues, but when you have exponentially more users looking at it, a rare issue will sometimes appear with more frequency.
There are no timelines as yet, only that all SKUs are being targeted for updates. Have you encountered any issues with DuckTales: Remastered?
Thanks to Ryan Millar for the tip.