Yes, cases for the iPhone 5 will fit the iPhone SE.
The new iPhone SE is exactly the same size and has the same ports as the earlier iPhone 5 and 5S, ensuring that you can use iPhone 5 and 5S cases with the iPhone SE and they’ll fit perfectly.
This has been confirmed by Apple, case manufacturers and our own Products team!
The iPhone SE’s changes are all internal, with a new 12-megapixel rear camera, more powerful A9 processor, and NFC for Apple Pay. The only substantive external change is the addition of a new colour: rose gold. To learn more about the new iPhone SE and Apple’s other announcements – including the iPad Pro 9.7 and new Apple Watch straps – read our event roundup.