I'm okay with a retelling of the origin (and key life events), as long as it doesn't undo what's been established since Rebirth.
After the merging of nu52 Superman and classic-Superman in Rebirth, we really only got a very abbreviated view of his entire history in the following issue. A fully-fleshed out story, adding some new details and extra flavor around those events would be great.
That said, if the Bendis origin undoes the new Rebirth timeline and/or contradicts it, I'll be pretty frustrated. We don't need a yearly reboot of the origin.
And on a side note, I too loved seeing Supergirl in action next to Superman on the McGuire cover. More please!