[mrt2]

I don't think it's a device at all. That doesn't make sense. A new computer wouldn't eat into MS's market share as Microsoft doesn't make hardware. New laptops would eat into Dell's and other manufacturers market share but it wouldn't even touch Microsoft. The only way to eat into Microsoft's' market share would be with software that rivals theirs... Maybe built in support for Microsoft applications without the need for VM? Or maybe an amazing new server architecture seeing as Microsoft's real market share stems from Enterprise usage.

[SirTimothy1]

If you watch the beginning of this video, he talks about a blank square. Maybe 'brick' is a code name for the new 'blank square' for their product line. If this is true, then they are making something, and it could be a whole new product. Or it could be an update to an older one.