The remastered collection adds a plethora of new features to the franchise, including normal map support, better ambient lighting and higher poly asset control. Sources from PAX South say its one of the best looking games they've ever seen! An official trailer was released by Gearbox, which can be seen here. The differences in quality is night and day.
Enjoy a few screenshots from the official site if you haven't seen them already. Homefront plans on supporting the remastered, which means the classic version will soon be nothing more than a legend. The pre-sale on Steam is 15% off so buy it before it rises in price. Not only does it come with the remastered versions, but the classic version and multiplayer supported by Steam as well!