Rumours are rife in indicating that the upcoming LG G4 is going to come with a plastic body instead of metal. If such a thing is going to happen, then there is a high possibility for LG to introduce a more premium range of its G-Series.
The premium variant will surely be based on the original G4 but it will have more to offer like an aluminium casing and some exclusive hardwares. The availability of the premium G-phone will also make it all the more likely for the upcoming G4 to come out with a lower retail price.
Of course, nothing is going to change on the hardware front as both the G4 and the premium G-phone is going to run on the latest Snapdragon 810 processor with at least 3GB of RAM.
It is also important to note that the above are just our assumptions on the near future. As such it is best to take it with a grain of salt, at least until LG spills more beans on the subject.