Looks legit! http://www.sonyalpharumors.com/leaked-first-picture-of-the-crazy-sigma-50-100mm-f1-8-lens/

@Tron

Best idea is to provide also real source

http://digicame-info.com/2016/02/50-100mm-f18-dc-hsm-art.html

Just note that it is same as 75-150mm F2.8 for FF, and you can use speed booster to mount it.

Anyone that have this range, like Sigma 50-150mm f/2.8m or Tamrons/Sigma/Canon 70-200mm ones.

Specs

• 21 lenses in 15 groups
• 3 FLD glasses, 1 SLD glass, 1 high-refractive-index, high-dispersion glass, 3 high refractive index SLD glasses.
• 9 aperture blades
• 82mm filter
• Minimum focus distance 95cm
• Length is 170.7mm
• Maximum diameter 93.5mm
• 1490g
• New ultrasonic motor
• Inner focus, inner zoom
• Suggested retail price is $1480 (167,400 yen )
• Canon, Nikon, Sigma mounts
• April 22 release

PR

Building on the groundbreaking Sigma Global Vision 18-35mm F1.8 DC HSM Art Lens, the new Sigma 50-100 F1.8 (75-150mm on 35mm format) mid-range zoom lens embodies the same engineering prowess to deliver outstanding prime lens-like results. Factoring in the APS-C image circle of 1.5x, the 50-100mm F1.8 covers three popular short tele prime focal lengths: 85mm, 105mm and 135mm. Like the 18-35mm F1.8, the new 50-100mm F1.8 maintains a constant F1.8 aperture yielding exceptional brightness and resolution throughout the zoom, while simultaneously maintaining focus as the lens is zoomed, a feature videographers will greatly appreciate.

Sigma Art Line Image Technology Innovation

• Features three FLD (F Low Dispersion) glass elements, one SLD (Special Low Dispersion) glass element, and one high-refractive index, high-dispersion glass element to minimize aberrations.
• Redesigned and enhanced, the new Hyper Sonic Motor is 30% slimmer and provides fast and accurate AF.
• Highly durable polycarbonate diaphragm made with fluorine; blades feature carbon feather film offering exceptionally smooth operation even during continuous shooting.

Outstanding Zoom Lens Maneuverability

• Inner focusing and zoom design offer versatile shooting options
• Tripod socket for stable, comfortable operation
• Features 21 elements / 15 groups, Minimum Aperture: F16, 82mm filter thread, Minimum Focus Distance: 37.4in, Dimensions: 3.7x6.7, Weight: 52.6oz

Wow, street price is coming in at $1,099.00... not bad at all.

@Vitaliy_Kiselev Sorry, missed your update and edited my post :)

https://www.ephotozine.com/article/sigma-50-100mm-f-1-8-dc-hsm-art-and-mc-11-hands-on-29098

http://www.photographyblog.com/news/sigma_50_100mm_f1.8_dc_hsm_art_hands_on_photos/

http://dc.watch.impress.co.jp/docs/review/lens_review_2/20160427_755128.html