When you capture a title, that title receives a conquest flag. When you create a title (duchy and above), this creates a conquest flag to that title.
This is good. If I get this right, now when for example the kingdom of Sicily is created by a Norman (it usually is), Norman culture can be spread in their lands. So not only titles gained by conquest get the "conquest tag" but created titles, too. This conquest tag is quite new, because it didn't really work in 1.06...
If I continue with Norman Sicily example, now I if I don't destroy, say, Kingdom of Africa title, I can get Norman settlers in Africa. In 1.06 I had to destroy the title and wait for the drift to enable the settler event (I modified the landed.titles to get Norman Sicily and actually every time when I created some title as a character of any other culture which the titles were coded to - I think whoever creates a title, should be right to spread his culture, the coded cultures for titles are too restricting for my taste. Tight creation conditions are a different thing, I am happy with them.)
I guess if the Empire of Francia is created by Occitan character, Francia can get now Occitan settlers.