Where did that come from... Did you read the article?

"All devices will have a diagonal screen size between 10.1 and 11.6 inches, weigh between 520g and 1200g, and be between 8.35mm and 15mm thick. On the low end, 520g and 8.35mm would be considerably thinner and lighter than the iPad 2/3 and Galaxy Tab 10.1. Presumably the 1200g/15mm form factor is a laptop."