This is from the June solicitations list for DC Comics, which is up in all the usual places. I got the info here.
SUPERMAN RETURNS: KRYPTON TO EARTH
Story by Bryan Singer, Michael Dougherty and Dan Harris
Script by Jimmy Palmiotti & Justin Gray
Art by John Byrne
Cover by Adam Hughes
Produced in conjunction with Superman Returns director Bryan Singer and screenwriters Michael Dougherty and Dan Harris, four astonishing one-shots bridge the gap between Superman II and Superman Returns!
In the first, revisit the Man of Steel's origins and see the first glimmers of what has transpired since he left the Earth at the end of Superman II!
On sale June 7 o 40 pg, FC, $3.99 US
Okay, so as I recall, Superman 2 ended with Superman bringing back the piece of the White House roof and then rather shame-facedly saying "Um, yeah, sorry I just kinda took off like that. Booty call. Even I've got needs, ya know. Anyway, I'll try not to let that happen again." I never got any inkling that he then up and left the planet for good. Don't get me wrong, I agree with Bryan Singer that if you're going to make another chapter in the exisiting movie series, ignoring 3 and 4 is pretty much the way to go (sort of how everyone prentends Highlander 2 never happened). But this - and I wholeheartedly admit that this is a totally fanboy thing to complain about - this worries me a bit, because now it sounds like either A.) we have to pretend that Superman 2 ended differently; or B.) Singer took the "Superman flies off into the upper atmospheric sunset" shot that ends this and every other Reeve/Superman film a little too literally.