According to multiple sources unlike the 6 inch iPhone 6s, iPhone 5se will be a 4-inch iPhone affair.
What does iPhone 5se look like?
The image which is given below shows an iPhone 5se right next to the iPhone 5.
Its really easy to tell them apart, assuming you know your iPhone history.
The iPhone 5se features the same camera placement, volume rockers, mute button and standby button design.
However the standby button has been moved to the right side of the handset.
source: www.techworm.net