Just found this while browsing the Currys site.
DC50 Animal weighs just 5.4kg but has the performance of a full-size upright. The technology inside has not simply been 'shrunk', but concentrated - every angle and dimension re-engineered.
Four key cleaner head technologies combine to give DC50 Animal Dyson's most advanced cleaner head technology yet. It has been engineered for increased dirt pick-up across all floors. The cleaner head adjusts automatically to different floor types, and the brush bar contains carbon fibre filaments for removing fine dust from hard floors. Like all Dyson vacuums, DC50 Animal has no bag, so there's no loss of suction. With 2 Tier Radial™ cyclones, DC50 Animal has 19 cyclones that work in parallel across two tiers to generate high centrifugal forces. Unlike ordinary upright vacuum cleaners, DC50 Animal rides on a ball. It turns on the spot, steering easily around furniture and into difficult places. DC50 Animal has Dyson's latest Ball™ technology.