I know its popped up a few times in the form of alternate manufacturers and questions about when Magpul would be releasing the UBR Strikeplate. With no fan fare, its on their site and evidently is already shipping to dealers, with some customers already having them in their hands.
Your favorite Magpul dealers should have these now, or be receiving them shortly.
http://store.magpul.com/product/MAG331/34
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