This info was gotten from a Chinese leaker group who has gotten Pokemon leaks right in the past. (Khuck was kicked from there after leeching off them.)

There will not be any Z-A content revealed at Worlds.

Scarlet & Violet will be getting a small update in November celebrating the game's 2 year anniversary with a Battle Tower update.

DLC is not required for this and you will be able to fight Pokemon only found in the DLC too in the Battle Tower but the requirements for accessing the Battle Tower are currently unknown.

The Battle Tower will be located in Levincia and it's owner is Iono's manager.

Iono has also gotten a new look and she wears a futuristic outfit with eye visors.

Her role in the Battle Tower is a 'Battle Queen', she wants you to help her Pokemon Battle streams to get lots of viewers.

It works like the other Battle Towers except you have to gain viewers by doing different things in battles (Knocking out opponents, Terastalizing your Pokemon, winning battles, etc...) but you can also lose viewers in battles as well.

If you lose too many viewers, you will instantly lose your streak. (Losing in a battle also instantly makes you lose your streak.)

Once you have won enough battles, you will be able to fight Battle Queen Iono who has went all out for the fight, you will earn/lose double the viewers for the match and on the second go you will be able to receive a special Ribbon.

The Battle Tower has 2 formats, Single Battles and Double Battles, both letting you earn a special Ribbon.

Once you lose, you will be rewarded by how many viewers Iono's Pokemon Battle stream has managed to get. (More viewers = better the rewards.)

A brand new item will be introduced that is only obtainable from the Battle Tower called a broken bottle cap, it decreases a Pokemon's IVs by 1 point, it is very hard to obtain.