Scott Walker and Marco Rubio have both issued "plans" to replace Obamacare with something that will make their base happy because it isn't Obamacare. I actually read them both and as Jonathan Chait notes, these aren't really plans so much as "skeletal descriptions of planlike concepts." In other words: "Actual Proposal To Come After I'm President."
But actually, I don't think either man will ever be President and they won't offer any further details before their candidacies end. To do that would hasten those endings because further details would reveal that they'd leave millions of people who now have decent, affordable health care with worse coverage, more expensive coverage or no coverage. Either that or their plans would repeat all sorts of things about Obamacare that their base considers evil…and they sure won't announce that.