If they're making this big of a deal about it shouldn't it be a really big addition? I think more likely they're just going to update the site, post set times, or announce some non-artist related addition
It's probably nothing at all. The "Ø" was probably just Pitchfork bein' cute in their own little hipster-douche way. "Nothing Major" is probably just them saying, "Don't expect anything big, we're just fixing our site, doodz."
In related news, in trying to find what the character Ø is called (still inconclusive), I found this fun tidbit: en.wikipedia.org/wiki/Ø,_Denmark