I expect most people will have some agile experience already, although we typically get a few people coming to our other conferences who are new to agile.
We're aiming for a 3 track conference so there should be content for everyone. We usually have a developer/tester track for example, one aimed at project managers/scrum masters and one aimed at product owners/BAs. It does depend a bit on who submits which sessions for the conference.
Take a look at our last event in Bristol for an idea of what the programme might look like: