As per the images which are shown as based on the people who have seen the phone & possibly who are worked on it and it is not the end product.There might be some design changes in the future.
OnePlus 5 will be completely metal built as seen on OnePlus 3 & 3T. It has Dual camera setup and LED flash at the bottom.There is no fingerprint sensor at the back, probably might have similar fingerprint placement as seen on OnePlus 3T.
As far as specs rumors tell us that it might come with SD 835 chip with 6GB RAM & storage upto 256GB, which will be fueled by 3000mAh battery. This time the OnePlus 5 will be just 7mm thick.