Per the shake test, that does remind me of the official Surface drop test on the Surface Youtube channel... the funny "oh, okay, still recording" bit at the end of the clip was great.
I think the only issue that could throw a wrench into your design proposal is that we don't know what the two new Surface angles are. The 20 is a given, I think, but if the second one is very close to one of yours, that's a bit redundant. On the other hand, perhaps the actual covering function will negate the redundancy dilution for some folks.
A couple more comments about the existing design: Would it maybe be possible to have the case fold such that the backside is perpendicular to the table when the Surface is in its 20-degree native slant? That way it wouldn't occupy any additional depth on, say, an airplane tray. Also, perhaps having color-coded or labeled folds would help with matching the origami bits to different angles, I don't know...
Thanks oion for all the great feedback.
-Possibility of Redundant Angles with Surface 2: True, so we will have to wait and see. The good news is that we can make a new case with new viewing angles for the Surface 2; the case's viewing angles can be changed by modifying the proportional of the size of each panel.
-Hide Case Backside when Kickstand is Deployed: Yes! Actually, the case can already fold up to take less space. Will plan to demo this in a video.
-Color-Coded or Labeled Folds: Very good suggestion, I've been thinking about this problem too. How about we initially put stickers that are colored / numbered on each panel, then once the user gets the hang of it, they can remove the stickers?