Aviation Week had a pretty good article about this plane
http://aviationweek.com/awin/textron-unveils-scorpion-light-...
Outside of the politics, the bigger issue is that it lies in a kinda idiotic middle ground. It's not good enough to go against more advanced fighter jets (so you can't use it to ensure air superiority) and it's not as cheap as "weaponized" trainer aircraft - which is what most governments need (to bomb rebels or whatever)
You can buy a L-39 for ~$200K, retrofit it with modern weapon systems (easier said than done, but still) and you won't be that much worse off than a guy with a $20m Scorpion.
Just a cost comparison from wikipedia
Aero L-159 Alca - $13-17 million Northrop T-38 Talon - $5.9 million Embraer EMB 314 Super Tucano - $9–14 million