The main purpose of mobile louvres is to have a better aerodynamic, Jazz does not have this and other useful features to keep it cheap. A device present on some Honda hybrids is the heat exchanger used to exctract heat from exaust gas, placed after the kat converter; Accord and CR-V hybrid (both with a 2.0l engine) have it, while other hybrids with the 1.5l does not fit it, Insight and probably Jazz. Same reason, Jazz would become too expensive with all this feauters.
About the heat pump... Having it would mean to have a complicated compressor, an inverter and a bigger battery if you want the compressor to run with the petrol engine off and this would hardly prevent the petrol engine to run, because the heat pump need energy; they could use a bigger battery but this bigger battery should be recharged. Is this a good idea for a cheap car, considering that this would be useful only in the first 3-4 minutes of usage?