A lot of people are going ballistic over this right now. Me, I’m on the fence.
I’m skeptical for a number of reasons, not the least of which is the form factor itself–I see foldables as much more of a tablet thing than a phone thing (I think whomever came up with the concepts for Westworld is a genius), and have concerns about durability and real-life usability (especially because… Android, but never mind that right now).
On the other hand I do miss the Psion Series 3, the Nokia Communicator, and a bunch of subsequent devices that, albeit not foldable, were great clamshells and well worth the added weight and bulk for going above and beyond being “just a phone”, so I think they might be onto something here.
Update: This FastCompany piece is the closest thing to an actual review right now, and touches on many of my views.