So tomorrow nintendo will be having it's first direct for 2016 and will be 5 mins in length, with pokemon as the topic. This makes sense since saturday will mark 20 years since the red and green versions(japan got blue later) came out in japan. While the red,blue, and yellow versions on 3ds are already known,nintendo has filed new trademarks for Pokemon Sun Version and Pokemon Moon Version. They did this last time in 2013 when they did a short nintendo direct and announced the Generation 6 games x and y.
Now it's seems very likely that they will announce sun and moon tomorrow but this is only speculation.
While the game will be coming out on nintendo's handheld I have a thought, what if they deside to have pokemon sun and moon as launch titles for the handheld NX since it's been rumored to be both a console and a handheld with the handheld unit out this fall?