We've heard about the possibility of Harvest Moon coming to the Wii U and now Marvelous Entertainment has said that they "are planning titles for Wii U." But, what is still up in the air is "how much [they're] going to commit to it, [they're] still thinking about that." This is the full quote:

For Wii U, we think it will be appreciated by casual and family gamers. We are looking forward to hearing how much it will target core gamers, as well. While we are planning titles for Wii U, in terms of how much we’re going to commit to it, we’re still thinking about that.
Let's hope that "how much" swings toward a higher number.