It's not immediately obvious given the previous US and UK versions of the Doctor Who toys were identical, but Character Options and Seven20 (formerly Underground Toys) have released two very different toy sonic screwdrivers.
Here's a side-by-side look, with the CO (UK) version at left, and the Seven20 (US/Hot Topic) version at right. Click for bigger:
[url]https://farm2.staticflickr.com/1883/42607195640_4c4fde6377_b.jpg[/URL]
13th Doctor sonic screwdrivers - CO vs Seven20
Note that the Seven20 version is smaller and includes the striated look that you get from 3D printed plastic. There's not enough reference on the show prop to say for sure, but I'm leaning towards this being less correct based on the trailer and the photo that Robatto posted showing three sonics in their storage box. The CO has a pitted, cast white metal look that seems closer to the available reference.
[url]https://farm2.staticflickr.com/1843/29478601917_8b842e3f01_b.jpg[/URL]
13th Doctor sonic screwdrivers - CO vs Seven20
The Seven20 has sharper detail and more complete light ports (such as one on the underside which continues across the seam between body halves), which initially led me to think it was more accurate given the unique detail and much less symmetrical design to the light ports. However, based solely on the reference released so far, the pattern of light ports is more accurate on the CO version, which has a near mirror image on the left and right sides of the main body of the sonic (a detail supported by the iMac photo, the storage case photo, and the trailer). Geometry of the casing around the grip pivot and an additional scoop in the body immediately below the emitter is more accurate on the CO as well.
When it comes to features, the Seven20 knocks the CO right out of the water. The lights are much brighter, the rear grip has a 180 degree pivot, and best of all the emitter crystal spins when the lower button is pressed. Conversely the CO has dimmer lights, no grip rotation, no crystal rotation, and only one functional button, though the CO does have a unique "automatic on" function that is meant to illuminate the internal glow when picked up (it is very inconsistent). Both have the same two sounds at about the same volume, though the CO has a fun hidden third sound that is accessed by pressing the button three times (it's the morse-code type sound that was present in some previous CO sonic toys and accessed in a similar way).
Here's a final picture showing how they compare to some other replicas:
[url]https://farm2.staticflickr.com/1892/43698516144_9be0726af2_b.jpg[/URL]
13th Doctor sonic screwdrivers - CO vs Seven20