A lot of people speculate that pre-patch is going to be released on 19th july - but I personally think that around this date patch including Demon Hunters, Legion invasion, demon event etc is going to be released.
And as Blizzard has already stated, the first part of pre-patch is only going to include class changes and wardrobe system (it's a version of patch that we currently have on the PTR).
So when do you think this version of pre-patch is going to be released? In 2 weeks or sooner/later?