Arcane Archer should borrow from the magus in terms of how they work, in my opinion. The arrow progression where they get elemental and eventually aligned arrow attacks could be replaced with the magus's ability to infuse magical enhancements with his arcane pool - it'd add flexibility to the class.
Psionic archery (assuming you're using the Dreamscarred Press Pathfinder psionics rules) has the Psionic Shot/Greater Psionic Shot/Fell Shot line. You could expand on those abilities for a psionic archer class. I'd require Psionic Shot as a requirement for any such class, and possibly increase the benefits those feats give.
The ability to deliver spells with arrows is pretty iconic for arcane archers, and should be present somehow. Imbue Arrow from the Arcane Archer sucks for this; some way to deliver touch spells with a ranged attack should probably be included.
You'd have to pare down things from that, but that's where I'd start.