From The Digital Reader:
If you pre-ordered Kobo’s newest ereader because it was a premium device, you might want to rethink that decision. E-ink announced new screen tech today and the Aura doesn’t have it.
I have just received confirmation that the early hands on reports were correct. E-ink’s 4th-gen Carta screen tech wasn’t used in the Aura; it can only be found in the not-yet-released Kindle Paperwhite.
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Sadly, for Kobo, the $149 Aura is now going to be overshadowed by the new Kindle Paperwhite, which retails for $119.
. . . .
The Paperwhite has the same screen resolution as the Aura, and both have frontlights and touchscreens, but the Paperwhite will offer a greater contrast and a more reflective screen while still making use of the latest improvements that E-ink has made in providing smoother page turns.
Link to the rest at The Digital Reader