iPhone Duo Only Works With the $79 USB-C Apple Pencil, Not the Apple Pencil Pro
The iPhone Duo will work with the Apple Pencil, but support is limited. Apple says that you need the Apple Pencil with USB-C for the iPhone Duo, so if you have the Apple Pencil Pro, you may be out of luck.

It's likely the iPhone Duo doesn't support the Apple Pencil Pro because there's no magnetic surface for charging the pencil. The Apple Pencil Pro charges magnetically when connected to a compatible iPad, while the Apple Pencil with USB-C charges with a USB-C port hidden behind a sliding cap.
The Apple Pencil with USB-C does not support pressure sensitivity, double-tap, barrel roll, haptic feedback, squeeze, or Find My, but it does have tilt sensitivity. Apple charges $79 for the Apple Pencil with USB-C and $129 for the Apple Pencil Pro.
Apple says that an Apple Pencil will work with both the inner and outer iPhone Duo displays. It's the first iPhone that works with Apple Pencil.
Apple Pencil support won't be available right when the iPhone Duo launches, and Apple says it's coming later this year.
The iPhone Duo will launch on October 23, with pre-orders beginning on October 16.
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