UPDATE: I did update this post with new info!
I just got the following info from a new source which is now confirmed by a trusted source:
Sigma is going to announce tommorow (Feb 27) not one, but many native Sony FE Lens. Primes covering 14-135 mm ART Series. In the future, all new Art lens will be available for E-mount.
Trusted Source 2:
The trusted source added that there should be up to 9 lenses announced this week (he is not sure if the announcement is tomorrow or later into the week).
Reminder: Sony announcement today at 4pm Las Vegas time (it will be Feb 27 in the night in Europe and morning in Asia).