We just reported the size specs of first Dual-Sim Lumia, the Lumia 630 via a leaked product data sheet image. Now, the device has passed certification at FCC and if you will see the size specs revealed in its SAR report, it matches digit to digit to the specs revealed in PDS.
This may explain why the below Lumia 630 image posted by evleaks shows a single-sim device, while the product data sheet image above and screenshot posted before has Lumia 630 as Dual-Sim device.
So, we may be looking at 3 devices,