Bluetooth for Paperwhite 4 and Voyage 2 seems a fairly certain addition, because it allows Amazon to leverage Audible across the line, including on their most popular model. Along with that, I'd guess 8GB storage for every upcoming revision.
No idea if they bring the 7" display to other models. It would be neat, and in some ways it would make sense to simplify the production, but it is rather a main feature on the most premium Kindle. So to not cannibalize sales from Oasis 2, we likely won't see other 7" models for at least a year. But it will probably come in at least one other model. This is how the tech world works: high-end features trickle down to lower-end versions, and then new premium features (color?) go to the upper end.
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