Will we get any supports designed to function well with mages?
Like Braum with his passive working well with high attack speed allies (aka all the Marksmen except Jhin)? I'm not sure how it would work given that different mages' spells vary more than different marksmen's autoattacks. Maybe giving AP like Janna's shield giving AD? Affecting their next spell cast like Lulu's shield or Nami's E modifying their AA?
With mages starting to come bot lane, it'd be interesting to see supports that are designed to work best with mages. Maybe they'll mostly do physical damage?
One spell idea I can think of is increasing projectile speed for a few seconds. It seem like an interesting gameplay mechanic, but one that could be near broken in certain combinations, like Lux binding, Nidalee spear, Brand ultimate, or Nautilus ultimate.