That's awesome that Veronica is coming back! She was at Chicago Comic-Con back in 2010. I didn't actually meet her, but I walked past her table and she looked almost the same as she did in Clerks. As much as I love the character of Dante, he was kind of a dick for treating Veronica the way he did and for being so quick to dump her just so he could be with Caitlin again, a person that he knows cheated on him multiple times. I'm hoping that her character in Clerks III is painted in a good light, because I always liked her.
I'm also wondering if Rosario Dawson is coming back. Kevin has spoken very highly of her and that she would definitely work with him again if he asked her.