Well, here is an answer from an hour ago. It looked like they considered HW frozen, but now I read it so that they are considering some minor changes. It looks like they already have prototypes or perhaps HW from some OEM, and it's very unlikely that they would swap CPU at this stage if it's not pin and SW compatible. Maybe they will add some pereperals -- wireless charging, a LED, an NFC module if they would fit in existing case...