Well now we know. Thanks to Sabrblade, we now know that not only is it listed on multiple amazon websites across the globe, but the US listing also stated that this is an Amazon exclusive. Also, while the description does not state that he comes with the blaster weapon the original toy comes with, the box image does show that he comes packaged with the same gun (which can be seen below).
Amazon exclusive figure evolves from Nemesis Pax to Nemesis Prime
Comes with a special edition Decepticon Giza figure
Also comes with Dark Matrix of Leadership and Dark Saber accessories
Works with Prime Master figures (Prime Master figures not included. Each sold separately. Subject to availability.)
Includes Leader Class Nemesis Prime figure with Evolution armor, Decepticon Giza figure, Dark Matrix of Leadership accessory, Dark Saber accessory, 2 arm cannon accessories, collector card, and instructions. Ages 8 and up.
Listings:
Amazon US
Amazon Canada
Amazon France
Amazon Germany
Amazon Italy
Amazon Spain
Please not that this toy is not available in most of these sites yet.