Late last year, Samsung released the revamped model of the largest Note tablet, the Note 10.1 2014 Edition (which actually came out in 2013, despite its name). It brought with it a full refresh to the lineup, including high end hardware, a better display, and an improved interface. The S Pen became more valuable, and Multi-Window more usable. All in all, it was a good upgrade.
The Note Pro 12.2 is a continuation of that upgrade to the product line, as it's essentially a larger version of last year's Note 10.1 in both hardware and software.