This issue was given away for Free Comic Book Day on 2010-05-01. "Printed by World Color Press, Inc, Montreal, QC, Canada. 04/07/10."
This issue was originally solicited with a cover by J. G. Jones that had a shouting Superman on it (as well as Mon-El, Supergirl, Nightwing, and some other Kryptonians). That cover looked like a final cover including trade dress, but it was not used.
Story continued from Superman: Last Stand of New Krypton (DC, 2010 series) #3, and continues in Superman: War of the Supermen (DC, 2010 series) #1.
Story continues in Superman: War of the Supermen (DC, 2010 series) #1.