Kim Jong Il’s likely successor will be his son, Kim Jong-un.  Various profiles we’ve been able to gather so far:

NYT profile: http://topics.nytimes.com/topics/reference/timestopics/people/k/kim_jongun/index.html

BBC profile: http://news.bbc.co.uk/2/hi/8078562.stm

Economist: http://www.economist.com/blogs/schumpeter/2010/10/succession_planning

Guardian articles: http://www.guardian.co.uk/world/kim-jong-un

 

In other news, South Korean military has been put on alert as part of standard operating procedure…