Some of the models, such as several in the BX series, allow you to choose between using chipset-integrated graphics and discrete graphics, a novel power-saving feature that really should show up more often. The lower end models do not offer Blu-ray, which is odd considering how much Sony wants to push the offering. For OS offerings, Sony really has a mixed bag here. The GZ series offers various iterations of Vista, whereas the BX series offers only Vista Business and XP Pro.
There aren't any entry-level offerings, with the lowest priced unit being at around $900. You can read more information about each specific model. These models are destined for a Japan release next year, with release dates for other countries not yet released.