Very cool!

I think I found a minor typo:

GTK 4.14 will introduce a GtkGraphicsOffload widget, whose only job it is to give a hint that GTK should try to offload the content of its child widget by attaching it to a subsurface instead of letting GSK process it like it usually does.

I think that "GSK" nesr the end should just be "GTK". It's not a very near miss on standard qwerty, though ...