That $100 laptop for the kids of all "Third World" countries will use Linux, a free OS. I don't think the makers of Amiga OS 4 want to give their hard work away for free even if it already was ported to the $100 laptop hardware.
I hope it happens in as big a way as the original intent has planned and we finally have an installed user base that will be able to compete with M$. M$ needs competition to get their prices down and their quality up.
Life is made of choices, support the people and things you choose to have in your life.
I choose Amiga!