might be nothing in this but back in the old days some large dealers or groups used to sell there own (special editions) which were standard cars with some optional extras fitted to them , maybe this is the same sort of thing , however i may well be completely wrong im just speculating
 
Or maybe people are just jealous because they have 'common editions' and they are envious of the black edition owners, and therefore just want to deny all knowledge of our existence ;)

And before anyone starts moaning...this is obviously a joke :)
 
Mine has white wheels so there for mine is now a

"Leon Cupra R White Edition"

SEAT Never officially released a Black Edition MK2 Leon, They have released Ibiza's so either a dealer has started trying to sell Leon's with the BTCC kit as them so he can add £££ or people have just started calling them that but they aren't they are just Leon's with body kits