CA Smoke Detectors & Carbon Monoxide Rules Applicable

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i'm finding it hard to keep abreast of the most recent interpretation of the ongoing CO and smoke alarm rules as applicable to all units in CA, whether owner occupied, multifamily, mixed used, commercial, etc.

my area is Los Angeles county mostly, and mostly signal hill and long beach cities.

i've heard a new set of rules applies July 2015. what's that about? does it apply to all units, or just units for which any work (ie, remodelling, permits, new construction, etc) has been done?

is there any case where 'old' smoke/CO alarms are still 'grandfathered'? are smoke/co alarms required to be hardwired into a central system already? 

is one CO alarm per floor (and per unit where unit dwellings present) of the building required?

does one have to be both inside and outside of each bedroom where there is 2 or more bedrooms or what?