From the BBC:
London 2012 officials are considering proposals to move some events to save money, BBC London has learned. It is believed officials are looking at moving the badminton event to the 6,000-capacity Wembley Arena instead of constructing temporary venues. The economic downturn has put pressure on the Games' planners to stick to the £9.3bn budget, prompting the rethink.
Locog is considering all options, it says here.