Technology wise? Nano-technology is going to change everything. From the computers we use to the way surgeries and health is administered/monitored.
Gender war wise? Men and women will always see things differently but at some point women will come to grips with the fact that for all their politically correct stomping for equality, they don't want to bear the same burdens that men have traditionally had to. They'll also admit that they miss the niceties and perks that things like chivalry offered them. Actually, I take that back. Women are incapable of admitting anything.
Relationship wise? People are going to get married less and sort of just...be together.
Racial divide wise? In America, Latinos now outnumber African Americans. And while we are both minorities (in terms of power), we've both historically received the shytty end of the stick. I fear that as latinos gain more power and influence, they'll assimilate to white culture and interests and still leave black people out to dry. I hope not, but the largest bloc of latinos are Mexicans and Central Americans...and to a degree...Argentinians and Chileans....all groups of people with lesser "black" histories. In terms of the world? Africa is still (50-60 years after colonialism) trying to heal. As things improve and they take more control over their resources...it could emerge as an enormous economic powerhouse. But they'll have to nationalize things or kick out the white corporations that bleed them dry. That typically does not happen without some form of violent military action. So sadly some wars are likely to happen. You could argue it has already happened with Libya....
Fast food wise? People are not going to just start eating salads. Not in this country where Americans equate "freedom" with being able to do everything in your power that is against your own interest. I mean people flipped out on Michelle Obama for trying to get people to exercise and eat healthy in schools. How the fukk is that shyt controversial in any way? But it was... Eventually costs will sort of force us to take a harder look at what we choose to eat. Insurance companies will likely offer further incentives (we already do this) to get on wellness programs because it lowers medical costs.