According to an article from DigiTimes, Nintendo is set to launch their next console, currently codenamed Nintendo NX, in July of next year. The article states that the console will be manufactured by Foxconn Electronics, while Pegatron Technology is trying to "snatch" some of the orders.
These orders, according to the article, are set to be complete by February or March of next year, with production starting in May/June for a July release. They look to ship 20 million units in the first year, a stark contrast to the 2 million the Wii U has shipped this year.
Of course, this is meant to be taken as a rumor, but it seems possible at the very least we'll know more about NX in the next year.