Honestly? I doubt the devs will handle anything. It's up to the communities--the kingdom rules on down to individual towns--to say what's acceptable to RP in that area and what isn't.
Frankly I think a little prejudice will add some spice, especially to travelers. If a same sex couple wants to live in a town full of people who are against that union, they can either move somewhere more accepting or RP out their troubles. If someone of a different tribe comes into an unwelcoming town, they need to decide whether it's worth the risk of sleeping within the borders or risking the wilds.
On the other hand, life can be just as hard for those who RP prejudice; a town full of open-minded people can easily push out the one bigot who managed to put down roots. Or they can just apologize to newcomers because Dave over there is just old and set in his ways and just never cared for the Waerd anyway.
So the question becomes not what the devs are going to do about it, but do we really WANT them to?