Sigma 24-105 f/4 DG OS
We have received an image possibly showing a Sigma 24-105 f/4 DG OS lens. As with any image from an unknown source, there's always a possibility it's a fake, although those are becoming more and more rare.
We had previously written that such a lens was on the horizon.
Below is what we're told is a soon-to-be-announced Sigma 24-105 f/4 DG OS. We're told an announcement should come some time in the next 6 weeks.
This lens is apparently going to be bigger and heavier than the Canon EF 24-105 f/4L IS. It will have an 82mm filter, weigh 885 grams (the Canon is 670g). The lens will have 19 elements in 14 groups.
I will leave you guys to debate how legit the photograph is below. To my eyes, it looks pretty good. We'll try to confirm this with a couple of our Sigma sources.

cr