Apple is working on an-all new iPad with larger display of 12.9-inch. The Apple Insider said that the new Apple iPad Pro (commonly referred by Apple enthusiasts) will include NFC chip for tap-to-pay function for Apple Pay (works as Host or Terminal) and as well easier of pairing with others accessories and devices.
The source also mentioned that the bigger-size iPad will have a new touchscreen that support stylus (connected via bluetooth) and potential feature pressure-sensitive input like they have it on the Apple Watch.
On top of that the iPad Pro will also feature a USB Type-C input that replace the Lightning connectors.
A newer or next generation A-series processor will be introduced, perhaps an A9 (whereby the current iPad features an A8X processor)
Source: Apple Insider