While this is great news to see, there are still 4 months left between now and Blizzcon. A lot can (and probably will) happen that will affect whether there will even be an announcement this year. I hope there is something to announce, I'm just not sure, yet, it will be for D4.
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Actually, S16 starts 1/18/19 to give players time to get used to the new patch, which should drop on Tuesday. 2.6.4 is considered a 'major' patch despite no new content.