different colour, an inline mic, and supposedly more durable cables.
I had mine for more than four years already and they are still in good shape. I wish they will tell us what exactly makes this new cable better than the older version.
"Engineered for durability, the Porta Pro X has a thicker cable with strain relief on the connector and a more robust “Y” split"
Looks to me like they do tell you what's new. The connector's got some strain relief, which looks like a spring, and the Y-connector is less flimsy. On top of that, the cable's thicker. That much is all pretty obvious from the description and pictures.