So 8.0 is comming. It will be probably unveiled at Gamescom, but definitely not later than BlizzCon. With FFXIV getting it's next expansion late June, I wouldn't even discount an E3 announcement, despite that not being a thing for Blizzard. So what will be in it?
Well, I plan to theory craft about the what in a different thread. Let's look at the how much!
We are going to look at three scenarios. The pessimist, the optimist and the realist. We will look at the release version. No patch cycle stuff
Pessimist
The least ammount of content that still has precedent.
New race: 0 (Like WotLK, WoD and Legion)
New class: 0 (Like TBC, Cata, and WoD again)
New battleground: 0 (Like WoD and Legion)
New arena: 0 (Like Cata and WoD)
New profession: 0 (Like Mop WoD and Legion)
New zones: 7 (Like WoD)
New levels: 5 (Like Cata and MoP)
So pretty much WoD
Optimist
New race: 2 (Like TBC and Cata)
New class: 1 (Like WotLK, MoP and Legion)
New battleground 2 (Like Cata and MoP)
New arena: 2 (Like TBC and WotLK)
New profession: 1 (Like TBC, WotLK and Cata)
New zone: 13 (Like Cata)
New levels: 10 (Like TBC, WotLK, WoD and Legion)
A more mixed bag. But basically a lot like any of the expansions beside the last two.
Realist
This will be the average number. Total number divided by number of expansions. Rounded up if needs be.
New race: 1 (0.83)
New class: 1 (0.5)
New battleground: 1
New arena: 1 (0.83)
New profession: 1 (0.5)
New zone: 10 (9.5)
New levels: 10 (8.3)
Mostly what we got in MoP.