[msbarnett]

It won't be any better than any of the previous regular-sized kindles, and the experience sucks on them.

PDFs have a fixed-size baked in, typically 8.5 x 11 or larger, and the Kindle screen is much smaller than that. There's no intelligible way to reflow a PDF, especially not one full of tables and figures like journals and textbooks are. It comes out either unreadably small or with unreadably broken formatting.

So basically it's worthless for that use-case. You want a Kindle DX or a 10 inch or larger tablet to fit PDF content comfortably.