I can't see the attachment.
I presume it's this though.
Batman vs. Superman Billboard in I am Legend
You may have already heard about it ā there is a scene early on in āI am Legendā (Iām still writing a review for it, by the way) early in the film where Will Smith is in a deserted Times Square, and as the camera slowly pans, there is a giant āBatman vs. Supermanā poster/billboard staring right back at you. It looks like advertising for āBatman vs. Supermanā, and since the world of āI am Legendā has remained unchanged since 2009, what are the filmmakers trying to tell us?
SuperHeroHype has some background on the billboard:
[I am Legend writer Akiva] Goldsman was once attached to a real Batman vs. Superman movie, but the script didnāt get the green light. He also wrote Batman Forever and Batman & Robin.
In the movie, even though it is 2012, the virus hit in 2009, so Goldsman thought about which movies ācouldā possibly come to theaters in ā09.
http://www.beyondhollywood.com/batman-vs-superman-billboard-in-i-am-legend/