Will this feature be in Van Buren:
To the extent that they were to be used in Jefferson? No, not even remotely close.
Why not in Van Buren:
It was my decision. The dialogues in Jefferson were extremely complex -- not in terms of sheer displayed text, but in terms of the number of nodes, node texts and replies that made the dialogues up. Dialogues varied according to a huge amount of tracked information: ability scores, skill scores, deity, race, (and sometimes skin color, hair color, and hairstyle), positive and negative reputation with six factions, and the positive and negative reps with each of those six factions' two sub-factions... and also the positive and negative reps in regions. Oh, and then the sixteen or so epithets. It was a lot to track and a lot for the designers to deal with. At times, it was overwhelming.

Van Buren will still track a lot of data, and its dialogues will still check that data frequently, but not to the same extent as Jefferson. Just keep in mind that "the extent" of Jefferson was, IMO, greater (though not necessarily "better") than any RPG I've ever seen.