They put that bridge up over the gap between the end of the old East London Line and the bottom of the new line up to Highbury.
It looks great but I'm sorry I didn't get a chance to see them move it across. Must have taken MEGA CRANES.
Sadly, the EINE mural there has been totally painted over by another piece of grafitti. It was 'VANDALISM', though, so maybe that's apt. http://tinyurl.com/2n27m7