Per DAS charter feedback: The Fold Angle specification should be incubated in the WICG before it becomes a working group deliverable. For Fold Angle, we'd also like to see closer collaboration and input from the CSS WG on the design.
Having said that, we would be comfortable with having WICG incubated specs being explicitly listed as charter work items that the working group could adopt at a future date. However, we'd like to see them listed in a manner similar to the Web Apps WG Charter's section on WICG Specs (i.e., separated out of the main deliverables list for the working group).