Hi, I went to the second night (as well as the first night, but this post is about the second), and there was a question asked by author Salman Rushdie about whether Snape was good or bad, where he discussed how Jo had written him out (first as a not-a-nice-guy but still a good guy, but then ends up killing Dumbledore and is evil), and mentions that there is the theory that Snape and Dumbledore could have planned the entire 'death' and that Dumbledore really isn't dead and that Snape is still good.

Jo couldn't go into detail about Snape's true alliance, for obvious reasons, but did say that Salman's theory was correct and that Dumbledore was definitely dead (which she pointed out about three different times during the questioning session), so you can interpret that as you will.