Design
The iPad Mini introduced a fresh new design, taking cues from the iPod Touch to create a high-end tablet in an impossibly slender form factor. You could think of the iPad Air as a 20 percent scaled-up version of the Mini, as the two tablets feature near-identical styling details, the bigger one differing only by having more speaker holes on the bottom (80 vs. 56 on the Mini).
It's light, too, weighing just 1 pound in Wi-Fi-only guise. That's 0.4 pound lighter than the previous generation and 0.3 pound heavier than the Mini. In other words, the iPad Air's weight is actually closer to the Mini than to its fourth-gen predecessor. Indeed, pick up an Air and you'll be reminded of the first time you held a Mini. It's a "wow" moment.
Connectivity
With the iPad Air, Apple has stepped up to a dual-antenna configuration for Wi-Fi. Called MIMO (multiple-input, multiple-output), it theoretically doubles the maximum throughput of data able to be transmitted to or from your tablet, up to 300Mbps with a compatible router. This is far from new (Amazon's second-generation Kindle Fire offered the same last year), but its presence is certainly welcome here.