Sigma will announce their new 100-400mm E and L-mount lens and the 16/30/56mm F1.4 DC DN APS-C primes on June 18.
The bigger new is that Sony invited the press for an even on June 26. We are going to get the 12-24mm GM and likely also a new Sony A7sII successor. But it’s unclear yet of the press will have to sign an NDA or if the camera+lens will be announced to the general public on the very same day