capture of the Syrian border town of Tal Abyad from ISIS by the Syrian Kurdish People's Protection Units (YPG), combined with the previous fall of Kobane and other border areas, is a real setback to ISIS and threatens its source of international fighters reaching Syria via Turkey. The victory has also increased the flight of Sunni Arab refugees into Turkey, leading to charges by some Arab fighters that the YPG is ethnically cleansing the area; the YPG denies this and has urged the refugees to return.
Turkey is also concerned, both due to the renewed influx of refugees, and because the YPG's parent party, the Democratic Union Party (PYD) in Syria, is affiliated with the Turkish Kurdistan Workers' Party (PKK).
The Kurdish front against ISIS gets little coverage in the West, and what does get covered is mostly reported from Erbil in Iraq's Kurdistan Regional Government (KRG)-controlled areas. But the YPG is slowly capturing the Syria-Turkish border region of northeastern Syria (which Syrian Kurds call Rojava) from ISIS.
On a lighter note, I just learned Blogger's spellchecker does not include the city of Erbil in its dictionary. It suggested "gerbil" instead.