I still think 250, same as the Wii, and at a matched price of current consoles. There will be no reason for someone to buy and Xbox 360 or PS3 when there's a more powerful console selling at the same price point.
Also, we aren't going to hear anything about specifications. There is no way that releasing tech specs can help Nintendo. The only way we'll find those out is after they're in the wild and a hacker probes the hardware.
EDIT: Also, if they announce that WiiU will play Wii games in HD, then it will sell like hotcakes to anyone who already owns a wii.
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