https://www.techradar.com/news/apple-sends-out-march-27-invite-saying-lets-take-a-field-trip

The world seems to love a big Apple event, so mark your cards for March 27, which is when the next one is happening. 

Media invites were just sent out with that date and the tagline "let's take a field trip", as well as a promise that any new devices will focus on "creative new ideas for teachers and students".