If the wheelbase is the same as Swift, then person buying Dzire CS will be the one who wants boot without paying for proper sedan price. And seeing the boot, I don't think that cabin space will be more than swift. Is more like poor man's sedan.
Since Maruti is trying hard to put a boot to the swift, I thought of comparing the boot space with that of a hatchback like i20. I read somewhere that the boot for new Dzire CS is 315 litre which is the same dimension as the Skoda Fabia and not more than ~300 litres of i20. I am not sure if this is a VFM after all.