Resident Evil 6

The trailer for resident evil 6 came out last week http://www.youtube.com/user/ResidentEvil?v=a1lEs5y4udA a few questions came to mind how long after 5 is it? becuase leon is in it does that mean Ashley or Ada are in it? who is the girl with leon? and have they keep wesker? there are more questions i had with the trailer but they just the first ones that came to mind. And i will be getting it when it comes out