Wouldn't surprise me since they implemented the same thing on both iPad Pro models. Not sure I see as much benefit on a smaller device but wouldn't surprise me in the slightest.
Yeah, who knows. Maybe it'll be just for the Plus "Pro"?
Four is a lot, which I guess is nice. But two speakers should be standard. Something both Samsung and Apple need to figure out in their flagship smartphones. They don't necessarily have to be front firing either, in my opinion.