I started playing the Leilana's Song DLC tonight and I think it is VERY much a precursor to Dragon Age 2, just like I think Overlord in Mass Effect 2 was a precursor to Mass Effect 3.
In Leilana's Song you choose a general dialogue response and then she says something completely different, just like Mass Effect... like you pick "what are our orders?" and then the character says "So, Betsy, what do you have cooked up for us today?" And of course she actually talks. I bet this system will be in Dragon Age 2.