As you noticed, everything is not out yet in 7.2. Here are some answers and some possible answers:
(Source here)
When can I do PvP brawl?
4th April US, 5th April (EU), and that weekly reset for other regions.
When can I do class order hall campaign/questline?
11th April US, 12th April (EU), and that weekly reset for other regions.
When does class specific World quest unlock?
11th April US, 12th April (EU), and that weekly reset for other regions.
When can I do Legion assault?
4th April US, 5th April (EU), and that weekly reset for other regions.
When does Tomb of Sargeras Raid open?
https://www.worldofmoudi.com/the-release-date-of-tomb-of-sargeras-raid
When can I do Class mount quest?
This quest will be available to do 6th June.
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