The Internal Storage might be coming in different variants one is 64GB storage and on the other hand, 128GB storage which can be expandable up to 256GB Via SDcard slot. The Primary Camera is 23MP and Secondary Camera is 16MP for selfies. Oneplus 5 has 4000mAH battery with fast charging technology.
After reading this news you might be getting one Question in your mind (Dude what about Oneplus 4 then) company skipping 4 because it is an unlucky number. Note these specifications are leaked specifications it might change (OR) remains same when it is officially announced by Oneplus.