iPad Air 3 like iPad Pro and iPhone 5se with 6S level specs inside. March 18.

Sources near to Apple are now claiming the company will announce and release at the same time the iPad Air 3 and the iPhone 5se in March 18, Friday, despite there are another sources claiming it is in March 15, Tuesday.

The iPad Air 3  is  believed to take a leaf out of the iPad Pro's book. Among the changes rumored are a new, A9-based processor for more performance and an improved camera; however, it's the display and connectivity which will see the biggest improvements. For instance, the Smart Connector which Apple uses on the iPad Pro to connect the Keyboard Case is said to be coming to the iPad Air 3, opening the door to more accessories, while Apple Pencil compatibility is also predicted. That would turn the tablet into a smaller, more affordable version of the iPad Pro.

The iPhone 5se is expected to in effect package 6s-level specs inside a 5s-dimension case, complete with a 4-inch display. In short, it should satisfy those who clung to their old iPhone 5s because they didn't want a physically bigger handset, but who still want a faster processor, support for Apple Pay, and an enhanced camera experience. The iPhone 5se is expected to have both the Apple A9 and M9 processor and motion co-processor, along with the iPhone 6 camera and Live Photos support.

slashgear via 9to5mac

iPhone 5se "special and enhanced" coming in 4 inch for late March.

Apple`s rumored  small size iPhone will not be a 6C model at all. It is coming as a "special and enhanced" (se) iPhone 5s as 5se with the following upgrades:

• The chamfered, shiny edges have been replaced with curved glass like on the iPhone 6 and 6s lines
• The same 8 megapixel rear camera and 1.2 megapixel front camera systems from the iPhone 6
• Support for larger panoramas and autofocus for video recording
• Barometer for tracking elevation in the Health app
• An NFC chip for Apple Pay
• The A8 and M8 chips from the iPhone 6
• Bluetooth 4.2, VoLTE, and 802.11ac WiFi chips from the iPhone 6s
• Live Photos from the iPhone 6s
• Same Silver, Space Gray, Gold, & Rose Gold color options as the 6s line.

No 3D Touch included.  Still include a headphone jack

Apple hopes that this model could spur additional upgrades over time from those currently sticking to an iPhone 5 or earlier. 

The current 5s will likely be discontinued, and the “5se” will take its place. The new device is currently in production overseas and is planned for a March introduction ahead of a late March or early April release.

9to5Mac