Last year, Vietnam was a hotbed for iPhone 4 videos prior to its official announcement. Now, they're making their mark once again by being the first to out a preview of what could be the next version of iOS 4. A new task switcher UI, which now makes use of thumbnails instead of just icons, is highlighted in the video. This is reportedly test build 8A216 of iOS 4, though it's still not clear yet if this will actually be released to the public. We'll have more on this as this story continues to develop.

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