First the BBC reports a second clash, this time with Pakistani troops crossing the LoC, with two dead Indian soldiers:http://www.bbc.co.uk/news/world-asia-20945842

Twitter has unconfirmed reports that: a) one soldier's head removed and is missing, other body also mutilated; b) the Pakistani soldiers were from the SSG (SOF) and c) from Jason Burke (from The Observer):
Three possible reasons for clash. 1 hot headed commanders in sector, 2. tactical aim to infiltrate militants where no snow. 3 Pak Army wants to stir up eastern frontier to bolster domestic credentials and give Washington a fright.
Just great, one can only hope for a blizzard to descend upon the LoC and freeze both sides.