These phones might be ZenFone 3 and ZenFone 3 Deluxe
Asus was successful with ZenFone series, and it looks like they are working on ZenFone 3 and ZenFone 3 Deluxe.
First of all, these are not leaked photos, but rendered photos, so the real design might be a little bit different. However, these renders have a potential of showing the main design lines for ZenFone 3.
As you can see, it has a different design than ZenFone 2, and looks like it has a metal body. On the back, there is a volume button similarly to the ZenFone 2. However, it has a square camera rather than round one. I personally hate the design of the back, because I think volume button looks terrible in there and square camera would look better. Anyway, it looks like Samsung phone in the front, although the buttons are placed in the normal order.
Again, these are just renders.