do you mean, High Resolutuon Composite? the Oly OMD-EM5 II first offered it. however, it's done using senor-shift via its 5-axis IBIS. therefore, not OIS. so, unless Apple decides to switch from OIS to IBIS, they may not be able to accomplish that. and I'd much prefer OIS especially for video....
I know some mirrorless company (can't remember which) does a good job with combining shots using the offset from the OIS, so the tech is there for at least that kind of single lens implementation that can increase resolution.
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