Not much is known or evidently can be said about this device, but it appears Samsung is tossing around another prototype device featuring Windows Phone 7.
Perhaps it's the Cetus (SGH-i917)?
Though rather large and blocky, the device seems to feature, unsurprisingly, an AMOLED screen. Due to the Twitter's location, we're betting this isn't necessarily a device for the U.S., but who knows what Samsung has up their sleeve.
Our overall reaction: meh
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Daniel Rubino is the Editor-in-chief of Windows Central, 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 for some reason, watches. 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.