Sigma is rumored to announce the Sigma 28-105mm f/2.8 Art for Sony FE mount in September by Photorumors. Large f/2.8 aperture zooms have become very popular, especially from Tamron and I hope we get to see some f/2.0 zooms in the not too distant future.
Sigma Lenses can be purchased from Amazon and B&H Photo
Tamron 28-180mm f/2.8 Di III VC VXD Rumored To Be Coming Soon
via Photorumors