I would buy one for sure!! That is a very nice cover and looks to provide some serious protection.
Here is the responds from Seidio:
Thank you for contacting Seidioonline.com. We do have plans to make accessories for the Nexus 10; however, we do not have an ETA for those products at this time. If you would like to stay informed on future product releases for this device, we suggest periodically checking our online store, or you may sign up for email notifications by sending an email to the correct link found here: http://www.seidioonline.com/Articles.asp?ID=164
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Seidio Customer Service