Is anything happening Lore wise in AoS right now? Kragnos happened, and I know they're releasing Gargants and Underworld stuff, but I don't think there's been anything major going on
The Gnarlwood in Ghur, a living forest of meat trees, is the narrative centerpiece of both the latest Warcry and Underworld seasons. A Seraphon spaceship crashed there and it caused all sorts of people to flock to it.
In terms of events, the last thing to happen was Season of War Thondia, where the Krondspine mountain range have birth to its very own incarnate and it followed up on the introductory story arc of 3rd Edition: Dominion. It essentially involves a Stormcast Chamber and Kruleboyz fighting each other during the Dawnbringer Crusades with Yndrasta the Celestial Spear, Sigmars hand crafted Huntress, supports the Stormcast.
The story is in Ghur right now. The latest battlepack/Generals Handbook is taking place in Gallet, a continent connected to Thondia just to the west. Its a place full of cramped and dark tunnels full of terrifying creatures and where all the fights are currently being held. In White Dwarf there is an ongoing campaign involving the Shaman of the Ironjawz Choppaz Clan leading a large force across Rondhol and Lendu which is eventually going to end up at Everquake City, a newly established Free City in southern Lendu during the Dawnbringer Crusades. This Campaign is known as the "Great Stomp".
Aside from that, there are a bunch of plot points and threads being seeded with each book as each army updates their status to match the current edition. Im sure it will eventually culminate in an event because thats what they usually do.
Some plot points include, but are not limited to: Krondys and Karazai and their feud with Kragnoa. Morathi Khaines Snake part of her becoming enraged at losing to Kragnos during Broken Realms and departing to find him. Gordrakk capturing Fangathrak the Godbeast which holds the Arcway leading to the All-Points in its mouth, preparing to attack Archaon. Gobsprakk leading Kragnos in his rampage across Ghur and building a Great Waaagh. Olynder and Be'lakor's remnants of an alliance. Kharadron Overlords and Fyreslayers cooperating with each other after one guy reveals what Ur-Gold is to the other Duardin (formerly a secret), and instead of being greedy the other Duardin aggreed to form a Duardin coalition to collect Ur-Gold. Grungni's return causing all sorts of complicated feelings and ripples across Duardin society. Grungni forging Thunderstrike Armor to boost the Stormcast's ability to go home. The permanent death of an entire Stormhost causing unease in the civilian populace. And of course, the creation of the Dawnbringer Crusades and the relentless expansion of the Free Cities.
Some of this is fodder for novels exploring this or that. Some is for helping you establish your own narrative or to help create Campaigns. Some might be repurposed into later releases.