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I suggest that you contact your local support team for further information about release and availability since it may vary from market to market:
http://www.sonymobile.com/global-en/support/contact-us/contact-info/
The Sony BKC50 bluetooth keyboard case has been disconinued
From Sony: We regret to inform you that we are stopping the global launch of BKC50. The background is that the closing magnet had to be removed as it affected the sleep mode/wake up function of the tablet, which consequently implied a risk that tablet would fall out when carried. This decision is fully aligned within SOMC top management. We are looking into a potential back-up solution and will inform you as soon as we have more clarity about this. We apologies for any inconvenience caused.