Canon 80D still has a long way to go, so Canon will not be in a hurry to release 90D. However, from the point of time, 80D will be released at the beginning of 2015, and the next generation model can be updated in more than two years.
Canon 90D should still be 24 million pixels, but 4K should be added, and then some other content should be optimized. In general, Canon 90D should be a generation toothpaste machine, and there will not be too many essential changes.
At present, there is no clear indication that Canon will launch 90D in the short term.However, technological products are frequently updated. I suggest you pay attention to their official website or attend a photography exhibition to get the latest news
As for the release time of Canon 90D, rumors are flying all over the market.However, as a professional camera, Canon may announce it at the new product launch. It will be more reliable to wait patiently for the official announcement
As far as I know, Canon 90D's release plan has not been officially confirmed yet.However, the news in the photographic circle is usually very good. Once there is exact information, everyone will know it at the first time