On the Horhaus blog, artist Karl Kerschl discusses the Case of the Disappearing Superboy in the Teen Titans origin story that appears in 52 Week 47:
I did a two-page Teen Titans origin story in the latest issue of 52 (issue 47), and there was a change on one of the pages. Superboy had to be removed from the Young Justice scene for legal reasons (DC is in a rights dispute with the creators of the character) and in this case the most elegant solution was to replace him with a similar shot of Wonder Girl. It worked out fine, but I thought I’d post this for anyone wondering where the heck Superboy was in the pages of history.
He was there! We all saw him!
On a related note: After seeing Kerschl’s art in that backup story, I’m really looking forward to Teen Titans: Year One.