Apple is planning a special event that will be held at the end of March, according to an iPhone-Ticker.de report.
A successor to the iPhone SE will allegedly be launched during the event and released on Friday, April 3:
We get this information directly from the Apple environment and have no reason to doubt the reliability. According to this, the launch of a new device, which is almost certainly the expected successor to the iPhone SE, is planned for Friday, April 3. At the beginning of the previous week, the presentation should then take place as part of a press event, in all likelihood Tuesday, March 31st is scheduled for this.
The site notes that Apple’s spring event was held on a Monday last year but in 2018 it was held on a Tuesday. Thus, March 30 and March 31 are possible dates.