No it wont turn hot in my opinion the south is in an awkward position it risks severe damage to it's capitol and industry and for what in return will they recieve after they win which they would.

China is also in a dodgy position it does not want to abandon it's ally but it is growing impatient with N Korea.

Most of this sabre rattling is probably linked to instability in the leadership as people position themselves in the party for the eventual demise of Kim and the apponitment of a new leader later on.