[cairo] Spot colors (and CMYK)

[ecir hana]

Hello,
I've seen some messages about adding spot colors (or named color, or
Separation and DeviceN in PDF specs terms) some time ago. Or perhaps
even adding CMYK as well.
Please, does anyone know if there has been any developments in that
direction? Is it perhaps planned to include spot colors in the future?
Or, is this not very central to the current development?