There is an interesting change in product pages of PW2 for international shipment (sent to Europe etc.)
http://www.amazon.com/gp/product/B00CTUKFNQ - this was the 2nd generation Paperwhite I bought in Oct 2013. But now it's unavailable and the message says "There's a newer version of this item: Kindle Paperwhite with Wi-Fi (2014)."
http://www.amazon.com/dp/B00JG8GBDM/ - this is the "2014" model.
Both product pages are exactly the same - but someone told me that he ordered the "2014" model and it has 4GB of storage, exactly as NiLuJe wrote.