I did give an outlook on the possibility of adding Graffiti modes, but didn't "finish" this at any point. Just because the hardware is wired up to be capable of capturing all the required bits, it doesn't mean it's finished. If your key feature for buying the Indivision AGA MK2 is a Graffiti mode, then don't buy now, but wait for the firmware to include it.
I currently don't have any time that I could spare on Indivision AGA MK2 development. I'd like to finish at least one prototype before the Amiga 30-year celebrations.