I did some math off Seranthor's post. I got a few different numbers, though.
From what I got, at the bare minimum the next expansion would be announced March 18, 2017 ... except we're well past that point now. If we did an average, then the date would have been June 20, 2017. Again, we're past that. So on the long end, we're looking at October 13, 2017 which is within 2 weeks of Blizzcon. That's not to discount another announcement at Gamescon, but considering Patch 7.3 isn't live yet and won't be for a while, I don't see a Gamescon announcement. Blizzard may have a large presence at Gamescon, but also remember they now have another hall for Blizzcon. Why add another hall if they weren't planning something big? Blizzcon back in 2015 felt really hollow without the expansion announcement.
On another note, looking at potential release dates for the next expansion from averages of the previous ones, I got:
February 21, 2018
August 9, 2018
January 29, 2019
Knowing Blizzard, they don't release expansions for WoW in January/February. TBC was an exception and was intended to be released before December 2006 but got pushed back. So TBC is an anomaly that's not likely to be repeated. So that leaves August 9, 2018. Since that's not a Tuesday, August 7 or August 14 is more likely. But that's honestly too soon with Blizzard's track record. I'd be more inclined to believe a September-November 2018 release.
Goes to show you can't trust averages when it comes to releases. Blizzard will release the expansion when it's ready.
Expansion |
Announced |
Days (Annc/Release) |
Release |
Days (Release/Next) |
Days (Release/Release) |
TBC |
10/25/05 |
447 |
01/15/07 |
200 |
668 |
WotLK |
08/03/07 |
468 |
11/13/08 |
281 |
754 |
Cata |
08/21/09 |
473 |
12/07/10 |
318 |
658 |
MoP |
10/21/11 |
340 |
09/25/12 |
409 |
779 |
WoD |
11/08/13 |
370 |
11/13/14 |
266 |
656 |
Legion |
08/06/15 |
390 |
08/30/16 |
- |
- |
AVERAGE |
|
414.67 |
|
294.8 |
703 |
. |
. |
. |
. |
. |
. |
Predicted (Min) |
03/18/17 |
|
02/21/18 |
|
|
Predicted (Average) |
06/20/17 |
|
08/09/18 |
|
|
Predicted (Max) |
10/13/17 |
|
01/29/19 |
|
|