Onward! To the second playthrough! (Spoilers)

[JPhills]

Aside from Pelleas and Lehran, what can I look forward to being different? Any added dialogue or more light shed on backstories. That kind of thing.

[Saeclum]

A couple more cutscenes, including one revealing Soren's ancestry.

[Haken]

Past that, there's also the special convo between Ike and Soren, but only if they have both A supports.

[Mage Knight 404]

In Part IV Endgame-4, there's a convo that tells of the very first Branded child between Altina and Lehran, and how Goldoa started its isolation deal.

There's also a scene in the beginning of that chapter talking about the situation post-Yune's flood.

[Mini Nephthys]

Lekain talks a lot more about Sanaki's appointment as apostle at the beginning of the final chapter.