Some websites report that Sony Japan at Tokyo will have a premium event on October 12/13 is for a9 II launch. It turns out it is a fake news, this is “α Universe 2019 Premium Event” is for recently announced Sony a6600 & a6100 and two APS-C E-mount lenses and a7R IV.
From Sony Japan (Translate by Google):
We will hold a special event where you can pick up and experience all the mirrorless alphas, including new products just announced on August 29th (Thu).
We will be waiting for you to prepare a special talk show and a special shooting experience booth for the exhibition of gem works using new products by professionals.
So the new Sony a9 II is expected to be announced after this event, maybe in late October to November. Stay tuned.