It looked like the unveil of iPhone 5se reveal will happen at an event on March 15. On this date, according to some reports, Apple will also announce the iPad Air 3 and some improvements for the Apple Watch.
Now, however, the date is unsure. A new rumor from South Korea claims the event has been delayed. It will occur exactly one week later: March 22.
For now, Apple hasn't sent any invites, we have only speculations.