According to latest interview with Sony manager Mr. Tanaka at Photokina 2018 by Pronews.jp, Sony will soon announce new APS-C mirrorless cameras next. Mr. Tanaka said releases of full frame mirrorless cameras goal is already achieved, now it is time for APS-C mirrorless cameras. According to previous rumors, first upcoming APS-C mirrorless camera could be a high-end a7 style APC-C camera, rumored name could be a7000/a6800/a6700.
From Mr. Tanaka:
Originally there was a lineup of APS-C cameras as the entrance of the user to the E mount, but for the time being as a requirement of our existing users who are many pros and high amateur users, we must first enrich the high end, for a while I was on holiday. However, the high end also had all this, so it is probably a good time.