Regarding the claimed low self-discharge rate for Lifepo4 batteries, I checked my X-cell, which has been sitting for just over a month after the last discharge/charge test cycle, and it is 14.11V.
I have a fair amount of experience with batteries, from industrial sized units in the thousands of amp hour range, used as backup and maintained at float voltages, to smaller banks, used in solar applications, where deep discharging can occur frequently.
While this new technology would be too expensive for those applications, it is applicable to our bikes, where space and weight are a premium. Perhaps this is why current hybrid vehicles are using similar battery chemistry's.