Some german news outlets already got their hands on the new device.
Papierlos-Lesen.de released a quick review, with some pictures comparing the new Vision 6 with the previous Vision 5 (Kobo Libra H2O equivalent):
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https://papierlos-lesen.de/kurztest-...ision-6-70259/
They say the better contrast of the Carta 1200 display is achived with darker blacks. Especially noticable with the light turned on and with the inverted mode.
They also think that the lighting has been improved.