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No plans for flash support as its been superseeeded by HTML5 and really isn't being developed any more. Its pretty much dead on mobile http://www.engadget.com/2011/11/09/adobe-confirms-flash-player-is-dead-for-mobile-devices/ and so there is very limited appetite and demand to bring it to any other platforms when newer technology does a far better job.
I use both Apple and Android devices to share content to my BRAVIA from my PC and NAS wirelessly so its far from mandatory to purchase Apple TV
Thanks