I doubt you will see a class list before mid May at best and it will change some if past experience is a guide. I go for some of the classes, but mostly I go to see all the friends I have met at past expos and minis. There is lots to be learned by talking with the other attendees and there are always lots of little gatherings in the hotel lobby at night and at the expo in the hallways and the lunch/snack area. If your sole focus is classes you will be missing a lot of good stuff.
When do they usually announce the class schedule for the Expo? Trying to figure out which days I want to be there.