The Design should be more rounded to let the Device seem more like one piece. The other half shall be called TOH2 and the device Jolla J2 or similar.... Really, nobody cares...
Instead of a powerful processor, which the OS definitely does not need, it should be very battery-friendly: at the moment I would go with a snapdragon 400 dual core or Mediatek chipset.
2 GB RAM standard of course and preferably a battery with around 2300 may to last longer. Display between 4,5 and 4,7 inch and 720p, LCD or amoled does not matter, I'd prefer LCD. Cheaper and lasts longer.
Regards