Two days ago, I spoke to the major Handspring retailer in the UK to confirm my order and he said :

1) Treo 600 was being shipped to the Orange distribution depots on the 21st Sept.

2) They would become available shortly after that

3) The price was 299 but could go down as low as 150 depending on the contract.

It's looking increasingly like he knew what he was talking about.

Want one, want one, want one NOW.