I am always watching this video before Blizzcon, so I correct the hype level.
https://www.youtube.com/watch?v=PDX4PKlRoJg&ab_channel=TheChatGemSuggest you to do the same.
In the video above you will see how game mechanics changed in 2 years before release. Oh, and they promised arena dueling which never came..
On the optimistic note, I still sort of hope the D4 will be better experience than D3, which I still enjoyed quite a lot, but not that much as D2.
Cheers