Here's an interesting experiment in determining WoW subs. Let's search Google Trends for "World of Warcraft" and match it up with known sub counts.
There actually seems to be a bit of a correlation here.
1. I'm not sure what happened in August 2014 but there was a large spike of interest.
2. Both show a dip in mid-late 2014.
3. Both show a large spike giving us our 2015 spike.
4. Both show the dropoff right back down to old levels.
But Google Trends shows us what has happened since then.
1. The last major change in interest was when the 10th anniversary event ended. Interest in WoW dropped by a considerable margin once they removed the 10th event.
2. Interest in WoW has been mostly flat since the loss of 3 million subs.
3. Patch 6.2 has NOT resulted in a spike of interest in the game. There's been a slight rise but its barely noticeable.
I'd hazard a guess that subs are mostly flat. We're still around 6 million.