It would force an upgade of the A7ii at the same time, and I am sure that this is not yet ready.
I don't think so.
It's very clear that a good number of buyers base their decision on a "bigger/more expensive must be better" process and don't delve much deeper than that. Even
if when the APS-C IBIS, BSI, 4K, copper wired model comes out, those buyers will still perceive a superiority in the A7II. Besides, with the A7RII coming to market in a few weeks and the A7SII announcement in the waiting, the A7III will be here before you know it.
Also, Sony is pushing a marketing angle that highlights the advantages of the A6000 for sports. This will be easily adaptable to the successor. Add to that the absence of a just below $1,000 ILCE camera and you have all the ingredients for a release in the near future.
With respect to updates in sensors, the heavy lifting has already been done in terms of basic design innovations and manufacturing upgrades, and is now in production.
Sony is following a very interesting strategy and it's proving to be effective. Introduce a model and realize 50% of sales at an introductory price, allow subsequent models to coexist while slowly tapering off price of previous generations to clear out inventory. I, II, III, IV...
Expect the announcement of the A7SII and A6000II in October or November as Sony capitalizes on the splash of the newly announced cameras to keep momentum going.