The Vampire Diaries: Scoop on episode 4x20 "The Originals" from TVLine's Matt Webb Mitovich

Here's some scoop on The Vampire Diaries from TVLine's Matt Webb Mitovich's weekly column Matt's Inside Line for the week of 3/21/13. 

There’s conflicting information out there about whether or not the whole cast of The Vampire Diaries has been filming scenes in New Orleans for the back-door pilot episode, or if it’s just the Originals cast. Can you confirm which one is true? – Audrey
I am assured that TVD regulars definitely appear in the planted pilot, but the exact and complete RSVP list is a well-guarded secret – including who appears in New Orleans, in Mystic Falls or in both settings.

Link to the full article:Supernatural, Smash, Grimm Spoilers — Once Upon a Time, Grey’s Anatomy - TVLine