It looks like we're getting about 5 variations of every Artifact weapons, with 4 color variations of each, so a total of 20 different weapon styles for each spec. Multiply by 3 for every class, and we're looking at 60 weapons per class.
People are concerned that everyone is going to be running around with identical looking weapons but this sounds to me like there is going to be even more unique customization than ever before, even if the 'base' weapon is similar.
Also, sidenote, in the Purified Ashbringer description I think I read it say that 'Magni Bronzebeard forged the original Ashbringer, and he can forge it anew to make it stronger than ever.' does this confirm that he is back?