Hello @Tobias @prokoudine ,
Gnome Photos uses GEGL too, but that is a small project too
Yep. I remember its Indian guy main developer sending many patches upstream to GEGL in the long past.
On Gnome planet, I have never read anything about some big improvement these past months related to this project (but probably I didn’t pay enough attention…)
the folks over at Glimpse might come up with a new image editor that could be a nice front-end to GEGL. Maybe some animation tool.
With all due respect, I am a extremely skeptical about that…
IMHO, it all looks as “wapour-ware” to me [1]. Just my personal opinion of course…
Very glad to be proven wrong in the coming months, though 
[1] Glimpse 0.2.0 Released, Based on GIMP 2.10.18 - OMG! Ubuntu