There must be at least 10GB of free storage after the Windows 'out-of-the-box' experience has completed. That doesn't feel like a lot to me,
No mandatory battery life specs. Microsoft talks a lot in the documentation about 'All Day Battery Life' but there are no hard numbers for OEMs to adhere to. Will any Windows 8 tablet match up to the iPad's 10-hours of juice?
No mandatory camera requirement (except that if fitted it MUST be 720p or better). This seems strange.
No '2 second resume' rule for ARM hardware while PCs must resume from S3 standby in 2 seconds or less. Seems odd not to push for a lower limit, even if it's not 2 seconds.
There's one factor that we're still unclear on - price. I still think that this will be the make or break factor for Windows 8 tablets. If the price is right, people will give them a chance, if not, they'll give their money to Apple.
What are your thoughts on the Windows 8 tablet requirements?