We've even seen claimed pictures of the devices, but didn't know the precise size of the thingies until today, when an XDA-Devs forum member leaked the numbers.
Dimensions of the Sony C650X "Odin" are expected to be 131.6mm x 69.7mm x 9.8mm thick, and the weight only 5.04oz (147g). The Asia-bound Sony C660X Yuga is said to be taller but thinner at 138.6mm x 71mm x 8.1mm, and weighs even less at 140g, despite its alleged waterproof body. To put the numbers in perspective, the HTC Droid DNA is 5.55 x 2.78 x 0.38" (141 x 70.5 x 9.73 mm), so Sony's 5" phones are shaping up to be even more compact.
The global Odin version is expected to feature an IR blaster, like Sony's Xperia tablets, for serving as your TV, home stereo and so on remote control device as well, which would be pretty svelte.