From these leaked images, it is clear that the OnePlus One design language is on par with that shown off in the leaked packaging or retail materials leaked earlier. The handset features minimalist design approach similar to Oppo phones and resembles the Oppo Find 5 design heavily.
These new leaked press shots show different angles and views of the handset. It appears to have thin bezels, back panel without cover revealing the battery and presumably the charging cable. Interestingly, this cable looks like a standard micro USB cable, but the presence of an adapter makes it similar to a lightning cable in the iPhone 5. May be, OnePlus One is planning to incorporate some cross charging capability.
One of the images, shows the dimensions and the weight of the handset and one more with the battery cover. In one of the snaps, we get to see the StyleSwap back covers that look stunning with customizable options. The official specifications of OnePlus One include a 5.5 inch JDI FHD 1080p display and Qualcomm Snapdragon 801 quad-core processor clocked at 2.5 GHz. Also, there is 3 GB of RAM and 16 GB and 64 GB of internal storage options with no support for expandable storage support. To handle the optics, there is a 13 MP Exmor primary camera at the back and a 5 MP front-facer for making video calls. Connectivity is handled by aspects such as Wi-Fi, Bluetooth and Global LTE along with a 3,100+ mAh battery. Source
