SonyAlphaRumors got solid info that Sigma will launch four new lenses in mid July. Those are designed for Sony E-mount but I have been told they will be available for L-mount too!
The lenses are:
The current Sigma L-mount you see on the image on top are DSLR lens with long tube to make it fit on L-mount. The four new lenses mentioned in this rumor are designed for Mirrorless only!