My first thought when I say the buttons only on the right side were 'what if you're left handed!', but it seems they've thought of that:

"Comfortably turn the page with either the touch display or dedicated page turn buttons located on the front of the handgrip. Whether you choose to read with your left or right hand, Kindle Oasis automatically rotates the page orientation to match."

Having said that, when using my Kindle I often switch from one hand to the other to accommodate things like picking up a cup, or one arm getting tired.

This is also a lot more expensive that the Paperwhite, or even the Voyage. While the dual battery concept seems nice, I can't say battery life with my existing Kindle has ever been an issue... don't think I'll be upgrading.