if memory serves well, the 2nd device to be presented in 2014 should be a cheaper one without TOH (!)
appeal to the masses, remember?

the initial batch (50'000 pieces) got them between 20 and 22½ millions € (either 400 or 450 € / pce)
any further batch will get them 20M - minus manufacturing costs, of course

how to make it cheaper?

• symbianesque resolution (640x480)
• only front camera (if any)
• 8GB internal storage
• 512MB memory
• no 4G support
• did i already mention??? no TOH / NFC
  also due to / for a smaller device w/ cheaper case...
• as TOH is dropped, would it make sense to create a monoblock device (also cheaper)?
• would make sense however to keep the same SOC / CPU / GPU to save on dev cost / time, no?

so, yeah, maybe hardware keyboard (any?) TOH isn't really top of the priorities right now.
except colors - masses are sensible to fashionable aspects ¦-)))))
EDIT: which would be in favour of a back cover in different colors... :-\
EDIT': on the other hand, cost of changing tooling / design would be in favour of keeping the same dimension & form (i.e. a removable back, battery & all)