Well from what I got out of the post about it was that there will be a few different instances with plots of land in them. You pick the plot you want and your house goes in that spot. Once those fill up they said they would add more instances with more plots of land when needed.
I was just thinking that it would be better if they did it so that your FC would have its own instance where ppl could put the houses if they wanted to be by the other ppl of there FC. Making a sort of town for the FC would let you move around to other ppl's houses and could even contain a guild hall or something instead of using some elses house.