It’s real: Sigma 18-35mm f/1.8 DC HSM lens announced | Photography Gear News | Scoop.it
From nikonrumors.com - April 18, 2013 3:33 AM

The rumors were true: Sigma officially announced the world's first 18-35mm f/1.8 DC HSM lens: World’s first lens offering an aperture of F1.8 throughout the zoom range.SIGMA 18-35mm F1.8 DC HSM...