According to a screenshot of B&H Photo Video (Now already removed), the upcoming Tamron 17-28mm f/2.8 Di III RXD FE lens will be available for pre-order on 2am ET, Thursday, June 6th. Tamron previous said this lens will be available in the middle of 2019, seems pre-order of this lens will be soon. Currently still no price info yet. Stay tuned.
As already rumored before, Sony will announce a new 200-600mm FE lens, now we have just received a real world image of Sony FE 200-600mm f/5.6-6.3 G OSS Lens today. This lens will be officially announced on June 5-6, 2019. Stay tuned !