In one of the last couple updates he mentioned that the company had come up with a way to have them horizontal that they were proud of and ED agreed to get a sample done up to see how it felt. Presumably this is that sample and it is working well enough that he just wants some tweaks.
If the lower button does end up extending around the corner then it seems to me it'd be the best of both: you could click the "lower" with your knuckle and the "upper" with finger tips, as if they were horizontal.
The question that remains is if the upper button can be pressed with modestly fat fingers without accidentally pressing the bottom one too. Does anyone know how big ED's fingers are?
The shifted placement is indeed interesting and could work, however, the hinge is still the critical factor for using the upper button. To be on the save side, both buttons should be placed as low as possible, lower one even lower than in ED's recent sketch (shape seems to be good). Like the one from the Pandora the lower trigger could be part of the bottom side. Of course it needs a better fitting than the one from the Pandora.
At the moment, only ED can tell if these buttons work. ^^"