Obviously, they did not sell enough 15v3_DE to justify ordering 15v4_DE.
I guess the better question is: Will there be a 15v5_DE? (due maybe in about half a year)
And I assume this is only going to happen if they get rid of the 15v3_DE and see enough potential to sell the new one. The (probably) upcoming EU/Germany subsidiary might help with that.
I say, grab the sale. Impoves the likelyhood of future models to be available 