7.2.5 was abysmal in term of lore. 7.2 was where the bulk of it was. And even there, it was ridiculously small.
7.3 will have the bulk of the lore (as per datamined characters dialogues).
Plus, some devs, like Samwise Didier - who is Warcraft's Art Director, started
hinting at the next expansion.
I don't want to spoil you, but with this, plus the datamined dialogues, it seems that we are headed straight toward
an old god expansion.
7.3.5 will be the release of the raid tier... and perhaps the introduction of the next expansion.