According to interview with Tamron USA by dpreview at Photokina 2018, Tamron executive confirmed that they will make more FE lenses for Sony full frame mirrorless cameras. The first Tamron FE lens is Tamron 28-75mm f/2.8 Di III RXD lens, currently still out of stock everywhere, you can pre-order at B&H & Adorama & Focus Camera & Amazon.
The new Tamron FE 28-75mm f/2.8 Di III RXD lens now finally in stock and shipping at Amazon US. The US price is $799. This is one of the most popular FE lenses currently for Sony full frame mirrorless cameras.
What can expect from Sony at Photokina 2018 ? Sony currently has no new camera codes registered, so we may not see any new Sony cameras (a7S III, a6700, a77 III, RX1R III) within next 1-2 months. But we may see some new FE lenses around this Photokina.