Apple is expected to unveil a new version of the iPhone, known as the iPhone SE, a name which was first reported by 9to5Mac's Mark Gurman. Essentially an updated version of the iPhone 5s, the iPhone SE will come with a 4-inch screen and is expected to take the place of the iPhone 5s in Apple's iPhone lineup, which would leave it with the iPhone SE, iPhone 6 and 6 Plus and 6S and 6S Plus.
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Apple is also set to show off a smaller version of the iPad Pro, a tablet aimed at the enterprise market.
Also at the March 21 event, a date which was first reported by Buzzfeed's John Paczkowski, Apple is expected to show off a 9.7-inch iPad Pro, a size that has been reserved for the iPad Air.
Apple may not show off a new version of the Apple Watch, which was officially unveiled last March, but Apple certainly has some news to share about the smartwatch.
According to 9to5Mac, Apple will focus on new bands for the Apple Watch, as well as new software. Expected are an expansion of the Hermès partnership, as well as new colors for the rubber bands and more.