Focus Taiwan has an article quoting "a Taiwanese security official" claiming that China will begin construction on a second carrier in 2013.
There have been rumblings about China building more carriers all over the internet for years now, mainly on forums. However, in 2008 a Japanese newspaper ran an article stating that the Chinese will build 4 more carriers. (see this post for more details). This is the first time that anyone has claimed that China will begin construction in 2013.
As the summer rolls on, it will be interesting to see what developments come from the Chinese aircraft carrier program.