On the surface I agree Ichkeria - There seems little to be gained from the Syrian administration forces shelling villages in Turkey. One incident could be a stray round, an accident ,but more looks deliberate.
I have read that some commentators think that Syria might be trying to "Internationalise" the internal conflict, to gain more concrete support and aid from Russia, Iran, maybe China - and perhaps gain some aid from other middle east countries if they can portray this conflict as state-sponsored terrorism, sponsored and supported by the West.
Other commentators have suggested it might be the rebel faction, attempting to drag Turkey and NATO into the conflict.
Either way, such escalation presents lots of potential for catastrophic escalation......