I've done a search in the forums for typefaces used on WIRED magazine. From searching, I've concluded that the masthead is a custom typeface by Hoefler & Frere-Jones. (Correct me if I'm wrong please.) However, it seems WIRED changes their cover typefaces every issue.
I think that this issue has used two different typefaces for the Jan. 2013 cover - a serif and san-serif. I've used identifont.com and whatthefont.com and haven't had any luck. Hoping someone has an idea.