A Nintendo spokesperson has confirmed that there are no plans to show off The Legend of Zelda for Wii U at this year's E3. You can read the full comment below.
"As Mr. Aonuma announced, The Legend of Zelda game for Wii U is no longer targeted as a 2015 release. Rather than sticking to a specific schedule, the team wants to make this the most complete and the best game it can possibly be. The new launch timing has not yet been determined. Because we’d like to focus on developing the game, we aren’t planning on showing it at this year’s E3, where we will be highlighting games launching in 2015. We will let you know when we’re ready to share more specifics."