Fantia was last updated Oct 3, Sept 24 before that, and Sep 5 before that. Takeda's updates are fairly regular, 19 days is the longest gap I've seen in a while, so we can expect an update very soon (next week or so). As for what is coming up, a quick deepl translation gives this:
"After the next Rietta event.
Terena's event, Terena & Gaki and Kurt will be back again.
This will be a standing picture of the event where Terena & Gaki and Kurt go to defeat the sea monster again."
So it seems Rietta is up next, I can't remember the EV name or description, but it seems to be a follow-up to EV37. A screenshot of the stream was the last post on page 140.