It's only available on Sony Android tvs but I'm sure there are some folks that would like to try it on other AndroidTV platforms. Here's the play store link https://play.google.com/store/apps/details?id=com.ibm.events.android.masters.tv
This includes Sony Series XBR: X940D, X940C, X930D, X930C, X910C, X900C, X850D, X850C and XBR X830C.
http://en.miui.com/forum.php?mod=viewthread&tid=428000&page=17#pid10936832
Looks like the update might be released in a day. Here's to hoping.
"Greetings! I understand your concern and I apologize for the inconvenience you have experienced. I would like to inform you that we are rolling out a new update on 7th April. You can install that and update and check, whenever you receive it. Please get in touch with us if you need any further assistance. Regards, Anant Xiaomi Customer Support"