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However it looks like Nokia is restructuring some of its scheduled announcements due to its recent buyout offer from Microsoft, and we won't likely see the Lumia 1520 unveiling until the end of next month.
Sources have been suggesting that the 6 inch display smartphone will be unveiled on October 21st, with its release expected in November. The unveiling is expected to take place in New York City, where the Nokia Lumia 1020 was announced earlier this year. Being the first quad-core Windows Phone we hoped that Nokia would offer its across all carriers, but it looks like it maybe an AT&T exclusive at launch again/
source: Pocket-Lint