Microsoft still focused on Windows 7 for some reason.
Don't expect to see a WP7 tablet at any point in the near future. Microsoft's focus here is purely on smartphones for the time being. ElectricPig reports that Greg Sullivan, Microsoft senior product manager, has stated that Windows 7 will remain their go-to OS for tablet form-factors.
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The reasons why? Better touch support, more apps, software and drivers. There's still been some chatter (especially at the keynote) about a WP7 slate, but such a device does not appear to be due out any time soon.
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I won't say that a WP7 tablet would be good, but it should be VERY clear to Microsoft that Windows 7 is an awful OS for that purpose. It is too slow to boot and work, draws too much power and fails to take any sort of advantage over the more intuitive UI elements a touchscreen allows. There's a reason HP abandoned their Win 7 slate.