An ARM9 wouldn't be able to send video+sound streams to the tablet controllers, so it's pretty obvious that either Nintendo leaves that for the main CPU or they'll have to significantly upgrade the fuctionality/performance in Starlet 2.
There's the Marvell's president claim in 2010 that there were significant shipments of Armada XP units going to "a new gaming platform" and there's the claim that people at AMD have been calling the Wii U's GPU as a System-on-Chip, which suggests it has an integrated application processor of some kind.
Check out page 22 on this very same thread.
ARM is completely out of the equation, the Wii U's dedicated DSP should effectively work in tandem with the central processor making the audio footprint a veritable non-issue. (streaming to the subscreen) However some ARM components will be there that allow you to use social networking/browse the internet without turning the main CPU/GPU on, or perhaps impacting a paused gaming session. Similar to what is seen in the 3DS, a standby network processor functionality. Btw bgassasin, tell those maniacs in the in Gaf thread that Retro is definitely not working a next-gen DK. They are aggressively targeting the XBOX/PS3 demographic.
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