In terms of sound, I think DNA's going to be more similar to IAWLT, which is a good thing. IAWLT has held up much better for me than either Unbreakable or TIU. Even though it's the most recently released album, it's over 5 years old by now, and I'm still not tired of listening to it. Based on what we've heard so far, I think DNA's going to be just as good, if not better.
It just goes to show how important Kevin coming back was for the group, not just in terms of their sound, but the style and quality of music. I still say Kevin would not have allowed some of the crap they put on TIU LOL.