In fact on a December 2010 visit (I usually go to London about once a year) I saw signs announcing the plans for the construction of the beach volleyball site there.
I also saw the main venue when I was there this past March - it was pretty far along by then, with a huge new shopping mall built next door, plus easy access at Stratford tube station (Central and Jubilee lines).
The Jubilee line is like something out of the Jetsons. Hands down the finest subway I've ever been on.
