I've been using a Toshiba Excite 7.7 review unit in portrait mode for the past few days, to kind of emulate the Nexus 7 UI. I've found it surprisingly comfortable, more so than I thought. In fact, as I've turned in landscape while in the launcher, it's actually felt kind of squished.
That said, I can't imagine them doing the same for 10" tablets. Using a 10" tablet in portrait is just downright uncomfortable.
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