The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per wpcentral.com: "Your membership journey starts here. Keep exploring and earning more as a member. La…"
Wikipedia's Lumia 2520 article calls it "Nokia's first and only Windows[3]-based tablet" and lists 2 GB RAM, Adreno 330, Gorilla Glass 2, an f/1.9 Zeiss rear lens, USB 3.0, NFC and 267 x 168 x 8.9 mm dimensions.
Microsoft's own Windows blog confirms "The Nokia Lumia 2520 tablet will be available starting on November 22nd," directly matching the pin's stored 22 November 2013 date.
Engadget independently corroborates that "AT&T has just announced that it will release the Nokia Lumia 2520 on November 22nd for $400," confirming both the date and price in the pin.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.