First off, this isn't some "official Microsoft support thing", so don't even go there.
But evidently one of the developers (Nick Randolph) presenting at ReMix Australia used a Nintendo Wii remote in some fashion with the Windows Phone 7 emulator.
The Wii remote uses Bluetooth to connect to devices and it's been shown to be very hackable, running on everything from a PC to the new iPad. So any trickery to get it to work on WP7 is easily in the realm of plausibility.
What is exactly being used for? We have no idea. Could be just for simulation, could be something more interesting. Either way, sounds like these developers are liking what they see. I mean, just look at how shocked Stan is in that second Tweet.
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Daniel Rubino is the Editor-in-chief of Windows Central. He is also the head reviewer, podcast co-host, and analyst. He has been covering Microsoft since 2007, when this site was called WMExperts (and later Windows Phone Central). His interests include Windows, laptops, next-gen computing, and watches. He has been reviewing laptops since 2015 and is particularly fond of 2-in-1 convertibles, ARM processors, new form factors, and thin-and-light PCs. Before all this tech stuff, he worked on a Ph.D. in linguistics, watched people sleep (for medical purposes!), and ran the projectors at movie theaters because it was fun.