Sure, magic man and all-around seer Kevin Rose delivered the "news" that a refreshed iPod nano is coming in the form that slimmed up, tapered in, longish tube of a device -- but you might be looking for harder evidence. We've just come across two case-related designs supposedly destined for Apple's next PMP, but both raise as many questions as they answer. Chinese accessory-maker Beelan apparently has a silicon sleeve ready to drop ship to a location of your choice via Alibaba, and iDealsChina is showing off renders of the 4th gen nano and another case from "some unknown Canadian company." Unfortunately, neither design can really be verified, and as they've just appeared on the heels of last night's Rose rumor, the timing seems a touch suspect. We're wondering what the Engadget hive-mind thinks -- any meat on these bones?