Eidos was in my office with one. It absolutely blows the GBA SP out of the water. The screen is far superior with a full backlight. (vs the side lit GBA SP). The games that come out should be impresive, not the typical mobile phone that plays games, but a gaming device that is also a mobile phone. The specs are nice too, even by mobile phone standards: bluetooth, tri-band, gprs etc. I've heard pricing in order of magnitude of £300 ($500) off contract. Operators might sub it for c. £100 ($150)
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Jason