Oneplus is one of the best brands that produce quality smartphones. Although they are not too popular but be rest assured of their best smartphones. I don't even think I have reviewed any of their products on this blog but I have actually found them reliable.
Oneplus 5 is the successor to the their previous Oneplus 3, there isn't a Oneplus 4 because the Chinese believed the number 4 is bad luck so they don't make use of it most of times.
The leaked specifications shows that the device would come with a 1440 x 2560 Bezel-less screen, it is also rumored to come with 8GB Ram and would be powered by a Snapdragon 835 chipset.
I do believe this smartphone won't miss out on essential features like 4G LTE, USB Type C with OTG support, I expect it to come with a screen protector probably Corning Gorilla Glass and either an Iris or Fingerprint scanner.
I shall update you with the full specifications of the Oneplus 5 once it's available. Just keep being regular.