Apparently SD cards can't be used to store Wii U downloads unlike with the Wii although it hasn't been completely confirmed by Nintendo and the source is a translation of a recent Q&A.
Quote:
During an Q&A interview with Nintendo of Japan, details emerged about using external devices for storage purpose and while the translation could be off it detailed this.
* Downloaded software can go to internal memory or external USB device. SD Card not supported
* Your downloaded content cannot be transfered to another Wii U
* You can move content to USB drive but not copy
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http://www.screwattack.com/news/wii-...store-sd-cards
Details about the auto shutdown and energy saving features for the tablet were revealed to be completely customizable but on default the tablet will shut down automatically after 90 minutes of no use.