Dated September 30th, the trademark grant includes the usual laundry list of software and hardware it might be applied to that such broad claims do, with "Tablet Computers; Telephones" mentioned as well in that list, so Round might indeed be the name of a new Galaxy line that uses display substrates made of plastic instead of glass...
Source: http://www.phonearena.com/news/Galaxy-Round-trademark-granted-by-USPTO-indicating-a-new-Samsung-line-of-flexible-display-gear_id48041
Source: http://www.phonearena.com/news/Galaxy-Round-trademark-granted-by-USPTO-indicating-a-new-Samsung-line-of-flexible-display-gear_id48041