Chiming in just before NYCC (we have a lot going this year) to update everyone on some new RE6 content, and clarification on how this content is delivered. First and foremost, two free DLC items will arrive as a title update soon; No Hope difficulty mode (which is, y'know, super hard) and a co-op partner for Ada's campaign. Said campaign was meant as a solo affair for Ms Wong, but odds are you'd like to play through it again with a pal - soon you can!
Additionally, this update will make Ada's campaign available from the start; currently you must complete all three of the primary campaigns to unlock this bonus. So, a little something for those who aren't able to blaze through the whole thing in a weekend - if you're taking your time, you'll be able to access Ada's story without having to finish the others. And may I say, her campaign is pretty awesome."