Big Jim Miller was part of an exchange on Twitter yesterday that has spilled over into this morning, in regards to the nature of the comic books and their place within the MLP "canon". Today it looks like Jim has had just about enough and gave a tweet that sounds just about as definitive as we're going to get on the topic:
"Everything is canon until it's not. Nothing is canon until it is. The end.".
Miller does demonstrate that he is familiar with how the disputes arise, by relating the current situation to one of the oldest - the DC comics universe. A canon so convoluted that there is almost no such thing.
This particular resurgence of the debate stems from the concept art seen during the Ponycon director's panel, in which it appeared that the OCs of the comic book staff had been turned into show-animation. Fans again wanted to know if the IDW comics were part of the official canon of the show (which, many readers assert bring large plotholes to the stories).
Big Jim assured readers that "the comics and show will remain separate" before admitting he himself has not actually read them.
Basically in Jim's eyes, it doesn't really matter, just decide for yourself until you're shown otherwise.
Also a proper response.