Probably the usual. Sheer volume of materials and lower production volumes leading to higher prices. The A123-Headway cylindrical cells may well be a bit more expensive to produce than pouch cells, but I'm not sure what format the LiNiCoMn cells are that they're using.
LiNiCoMn seems to be a comparatively new chemistry. They're claiming 800 cycles vs 2000 for LiFePo. At least one person has advised me that unless you do huge numbers of miles it's not worth paying the extra for the extra weight and lifetime of LiFePo. In 2-3 years when you're looking for an upgrade the state of the art will have moved on anyway.
LiNiCoMn seems to be a comparatively new chemistry. They're claiming 800 cycles vs 2000 for LiFePo. At least one person has advised me that unless you do huge numbers of miles it's not worth paying the extra for the extra weight and lifetime of LiFePo. In 2-3 years when you're looking for an upgrade the state of the art will have moved on anyway.