Note the word "also" that GC uses twice in his post. For the record, they are fixing rogue mechanics to make the addon obsolete. But it sounds like there's more to it. Plus the addon still serves a purpose in pvp.
Remember this post by jerry? Here's a quote for the lazy ones:
There's a new database called BannedAddOns.dbc in the MPQ. This database has 11 fields on the latest PTR build, none of which appera to be strings.
As to how they will detect the "signature" of an addon, they can hash the compiled lua stream, for instance, which would make getting around it more difficult than just adding spaces or renaming variables.