So far I've found two bugs with the API since the changeover on Tuesday night, both on the "issue" resource. I posted each one separately in the Bugs section of the forums, but I thought I'd better mention them here in the API section too.
1) the "roles" in "person_credits" (writer, editor, inker, etc) have dissappear (more here)
2) we can no longer tell the different between an comic with no "issue_number" and an "issue_number" of zero (more here)
On the bright side, since these details were available in the previous version of the API, hopefully these will be easy bugs to fix...judging from the number of new entries in the Bugs section of the forum, the ComicVine devs have their hands full these days.