Hi NiLuJe,
I bought from amazon online US when i was in SanFrancisco a couple of months ago. it was the current model at the time. last week amazon sells a newer model which is current now.
there is no SO information in the kindle settings page or devices page.
here is a screenshot, you can confirm it too ! I only removed some name and personal info in two lines in that screenshot. other data is shown as it is on that page

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MOD: screenshot removed to protect Serial Number