At last MetaTrader 5 has been released in closed beta testing on 9th September, see here. I don't have a copy unfortunately, but am looking forward to the public beta, which I am guessing will start sometime in October. They cancelled the 2009 trading championships so they could concentrate on MT5 development, and I think many traders like me will be setting themselves a goal of entering the 2010 championships. If I ever get something going with my neural network approach then I'll find it much easier to translate the C++ DLL that I am writing into MT5.
My guess is that the earliest that brokers will start changing over to offering live MT5 trading is late in 2010.