Everyone's favorite rumors site has a post about a patent Sigma recently received for a 35mm f/2 lens. According to the source the image circle of this lens just covers the 4/3 sensor (and not APS) which would make this the first Sigma lens designed exclusively for , which is maybe the most interesting part of this rumor. Unfortunately, the source is in Japanese (which I can't read) so details are pretty sparse. Also, when I tried to search the patent number provided (2015-102559) my search turns up something completely different. Not sure what that means...likely that I don't know what I'm doing when it comes to searching patents. From what details are available, it seems this lens may be slightly longer (physically) than the Sigma 60mm/2.8. It seems that there is some speculation that the optical design will be similar to the Panasonic 42.5/1.7. The lens also apparently would have built-in OIS. If any of this comes to pass, it's at least an interesting lens that perhaps fills a small gap in the available lens lineup. The 70mm 135mm equivalent focal length is a bit unusual, but I'd rather see this than another 42.5/45mm offering if just for variety.