Generally the Wall Street Journal is very accurate about the things they leak.
Source: http://online.wsj.com/article/SB10001424052748703636404575352681516157268.htmlWall Street Journal said:Meanwhile, Sony is developing a portable device that shares characteristics of handheld game machines, e-book readers and netbook computers, according to people familiar with the matter. Some Sony e-book readers already come with 3G connections but it is not clear if a new wireless gadget will use carrier networks.