According to Today's Zaman, Syria's Kurdish PYD has has announced that it will declare an autonomous Kurdish region in Syria's north on 19 July. Maybe that explains also the recent increase in fighting in Ras Al-Ain.
According to this article (Syrian Kurds plan self-government) they want to form a provisional government for as long as the war lasts.
Of course Turkey is not happy about this. Neither is the US that sees both Al-Nusra and the PYD as terrorist organizations. That says in my opinion more about American hypocrisy than the situation on the ground.
A good overview can be found in this article (The Latest Sideshow: the PYD v. al-Qaeda) that provides a chronological overview of the fights.