There's a major possibility that we may see Kratos' long-lost brother in God Of War 3, given that he was hyped in an unlockable video in the first God Of War game. (Watch the video on your left).

Since he didn't make an appearance in God Of War II, there's a huge chance that we'll see him either face-off or aid his vengeful brother, the fallen God Of War. Since Kratos is in fact a character that derives from actual Greek mythos, it would only seem logical for the developers to follow the mythos when it comes to Kratos' brother's name. And that name would be Zelus. Strangely so, Zelus also means 'jealously' or 'zealousness'. Coincidental? Apparently in said unlockable video, Kratos' brother is seen plotting something against his older brother whom he thinks abandoned him as a child. It would only make sense for SCEA to go with this name.