Looks like 2010 might become an even better year for train fans. Brickset (http://www.brickset.com/) states that some new Harry Potter sets will be coming out in October 2010, as these sets are already listed on the South African Kiddiwinks store website. The list includes a new Hogwarts Express at a price of R1009 - which comes out to $138 USD. Look for it sometime this fall!
Update: Now that the toy fair pictures of the new set have surfaced, it is safe to say that this rendition of the Hogwarts Express will be a universal disappointment to train fans! However, the upcoming 3Q LEGO City train sets look pretty decent.