
According to Wikipedia the US is joined by Australia, England, Indonesia, Japan, Korea Republic, Mexico, Qatar, and Russia as bidders, with Belgium and the Netherlands, and Portugal and Spain as joint bids.
Ever since the US hosted the 1994 Men's Cup it has also hosted the '99 and '03 Woman's Cup. This makes the Federation hopeful they'll get one of the Cups. South Africa has the 2010, while Brazil has the 2014.
Right now it seems like the US is going to be a popular choice for one of the years it has bidded for.
Adam