Source: Superman Homepage
DC Comics editor Matt Idelson revealed in an interview with the Superman Homepage site thatS uperman will star in a major storyline with Superboy and Supergirl. Idelson states that you should look to Action Comics #5 and #6 for hints at the storyline.
Said Idelson, "Many things that will be factors in [Action Comics] this year are being established in issues #5-6, Frank. Grant (with the help of guest-artist Andy Kubert) has sprinkled an incredible amount of fun hints inside a really challenging story.
Meanwhile, Keith and Dan are plotting some really star-spanning stuff for Supes, though before that we'll be doing an event between Superman, Supergirl and Superboy in the summer. Superman hasn't met Superboy yet, and his relationship with Supergirl isn't exactly lovey dovey."
He added: "Seeing how they function as a unit under those circumstances should be interesting, to say the least."