While Araby may the release of its final expansion, The Silence and The Fury.
In a new video update (below), Creative Assembly wanted to remind us all how generous the studio is by highlighting all of the free content that's been released for Total War: Warhammer II since it was released back in 2017. To be fair, there's a decent amount, although it's mainly singular units and legendary lords, so your mileage will vary depending on the faction.
At the end of the video, there is a teaser for the next (final?) bits of free content coming to the Total War Access will receive a new unit, and "new reinforcements", whatever that means. As a reminder, TWA is Creative Assembly's free loyalty program. It's kind of under-utilised, but every now and then will get free bonus content like this.
Here's the Free-LC Array trailer. The teasers are at the end:

There's plenty of speculation as to what "reinforcements" means. One theory is that it will involve a new Regiment of Renown, as Total War Access got quite a few free RoR units as part of Creative Assembly's 30th anniversary celebrations.
Related: Total War: Warhammer 2 DLC guide
Regardless, the timeframe for all of this is "soon". Total War: Warhammer II The Silence and The Fury will release on PC via Total War: Warhammer III's release date is later this year.