This artical doesn't make any sense...
Have a look at Newegg,
A6-5400k, A6-6400k, A8-5600k, A8-6600k, A10-5800k, A10-6800k, Athlon x4 750k
All have unlocked multipliers. All have black boxes and have names that are followed by a "k". None are refered to as "Black Editions".
The odd man out is the Athlon x2 370, which has a black box, no K, but has been reported to have an ulocked multiplier. I could not find it on AMD's site to verify that though.