I'm sure this will be a common topic here, but let's get things started on a general discussion. This is not necessarily things you hope FFG will make so much as ideas you want to flesh out yourselves.
What cool ideas are already brewing in your heads? What awesome stuff do you feel like sharing?
Personally I have 3 children so Harry Potter, Lego Batman Movie or Lego Movie and something Narnia related are all churning in my mind. I think they would enjoy Supers too
But Warhammer Quest (actually Hero Quest but it's a gateway drug) was my first love, followed by WFB and WFRP, so I'm chomping at the bit to bring Narrative Dice 2.0 to the Old World. I'm interested to see what magic systems FFG present and how I can bring Corruption into it
Fallout (1&2) was also hugely influential to me, so looking forward to what @DarthGM gives us.
Finally there's The Wheel of Time, most enjoyed series (that's actually finished). I own a WoT RPG that's adapted d20, but it never resonated, I think GeneSys would be far better.
but I'll never get time to play all that, so I just get to speculate for now.