Well I would hope they would focus on games releasing this year. Key word: focus. It's very likely that 20 minutes of their digital event will be 2015 games and then the remainder will be teasers/trailers of upcoming games. That would still constitute as focusing on 2015 as 2/3 of their stream is 2015.
Anyways, they still have a lot of titles releasing this year outside of Zelda, so it would make sense. And they still have their directs so it's not like they can't reveal 2016 games via that method.








