I Initially heard darkOath/Beastmen 'this year' but conflicting info from different sources. At this point I'm not sure how they'll fit in the calendar as Genestealer Cults will also be squeezed in the above quick cap probably around Nov too. Roguetrader is a single release (ala killteam), Grots will be drawn out as will 40k Orks and the Darkoath release I heard was a full one- so maybe 3-4 weeks worth.
So I would guess maybe in the new year, but I've heard thats the Slaanesh slot too....?
GW have been juggling and moving around releases based on a few things - leaks, capacity issues, changing/revised narrative.
But Grots (note im saying 'Grots' because at this point based on what I've been told on the range im not even sure theyre 'moonclan' anymore) are happening very soon and I wouldnt be suprised to see them this weekend at Warhammer Fest Europe or at the latest Nova panel next weekend