Here are two of the latest aerial photos taken of the Olympic Park showing where the International Broadcast Centre/Main Press Centre (IBC/MPC) will be:

Covering an area of 1.3 million square feet, the IBC/MPC will be a 24-hour media hub for around 20,000 broadcasters, photographers and journalists during the London 2012 Games – bringing coverage to an estimated four billion people worldwide.
After the Games, it will be used for office and business space, generating over 8,000 new jobs in Hackney:

A video from the unveiling of Orient Way, a railway siding facility in the Olympic Park. It will be used to park the extra trains used during morning and afternoon peak hours when they are not needed.