What will be the biggest possible bonus during ICO?
It is still unknown as we don't even know when the sale will start...
It has yet to be announced AFAIK.
Team said that it will happen until end of Q3, so it should happen any day now.
I'm hoping they announce it soon so that they can get this hype going on again before Christmas sales around the world

If the sale starts soon, everything will be ready before hype arround Christmas
