Terminal 5 at Heathrow is being built at the moment, and after what seems like years of basic construction they are starting to get into the fitting out of the T5 terminal with the technology that will support the airline and shop operations.

There's a good overview of the some of the challenges and progress at Silicon.com. To quote from the article:

In any construction project these days, IT integration has become a major part of the process. With T5, BAA tells us the IT systems represent the greatest risk for the project. There are 100 shops that need network connections, and the airport itself will have wireless services, flight information boards, mobile networks, CCTV and building management systems. And, what's more, all these things must have a certain amount of scalability.