What's the story behind the EA-18G wing mods?

If you look at the EA-18G wing, you’ll notice
— a different sawtooth geometry
— the addition of a wing fence
— and as it seems (seems!) a more extensive ‘porous’ element along the wing fold

The wing fence was announced earlier. But question here: As the current F/A-18F are said to be “fitted for but not with” everything they need to be turned into EA-18G, does it mean the wing fence is now standard on the F also?

And then the new saw tooth: For one the same question as above – is that saw tooth now standard on the F also?

And: Does anyone have an idea what the benefit of that new sawtooth geometry is?