Same-day update: There’s a video demonstrating this. See it after the break at the end of the post.
This is huge, huge news.
It’s Chuwi that announced it, probably to prop up sales of its V88 and V88s. But it’s not Chuwi that’s doing this, it’s Rockchip. So we can expect all iPad Mini clones (and possibly all tablets) based on the Rockchip 3188 platform to get an Android update that offers the option of multiwindowing.