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After Nintendo's Gamer's Press Summit on 8/22, Gamespot and IGN both reveal new Prime and Fusion hands-on impressions (links below) after playing the latest builds of the two new Metroid titles. SPOILERS abound, so beware. Nintendo also announced that Prime and Fusion will feature connectivity between the Gamecube and Game Boy Advance, though no details are available yet.
Gamespot: Metroid Prime
Gamespot: Metroid Fusion
IGN: Metroid Fusion
IGN: Metroid Prime
--TJ