Good news/bad news for Shovel Knight: Treasure Trove's Version 4.1 update on Wii U. While the Switch update went live yesterday, the Wii U update is still being worked on. Thankfully it's in final testing, and as long as all goes well, a release should be right around the corner.
Unfortunately, due to technical reasons, this update won't include the 1:1 pixel scaling feature. Everything else included in the Version 4.1 update should be there. For a recap on Version 4.1, check out the patch notes here.