Apple will introduce new versions of iOS and OS X at its annual developer's conference.
iPhone SE and 9.7" iPad Pro Orders Now Shipping Ahead of March 31 Launch
Multiple users tracking their iPhone SE shipments in the MacRumors discussion forums have received delivery estimates of between March 31 and April 4. As usual, it appears that UPS is Apple's primary courier for orders placed in North America, while DPD and UKMail are handling deliveries in the United Kingdom.
iPhone SE Order Tracking
→ United States
→ United Kingdom
→ General Discussion
iPhone SE should also be available tomorrow at Apple retail stores, and through AT&T, Verizon, Sprint, T-Mobile, and select other carriers. Authorized resellers like Best Buy may too have limited stock, generally on a first-come, first-served basis. Some retailers may accept reservations for in-store pickup.
Apple's first wave launch countries for iPhone SE include the United States, Australia, Canada, China, France, Germany, Hong Kong, Japan, New Zealand, Puerto Rico, Singapore, and the United Kingdom. Orders started March 29 in an additional 20 countries, with more to follow in early April.
9.7-inch iPad Pro orders have also shipped for many customers. Keep track here.