You can hear he's sort of adopted Stephen's vocal inflection and some of his melodic tendencies. Or vice versa.
I think it is more Stephen adapting. I remember hearing how Joey for the most part is one of the main writers of Anberlin if you watch the dvd on cities he seems to have a lot of say in vocals and writing.
This sounds good. Joey is a great songwriter. Anberlin fell from grace when he took a step back from writing. I'm wondering if his involvement with writing increased with their new album because it's much better than the previous two albums.