CSR mechanics query

Prior to game launch,it was stated that CSR would be coming in 2013 and that prior to its launch, 343i would decide if the stats they’d tracked until that point would stand or, everyone would start fresh. Well, it was always going to be that everyone would start fresh and so that has been announced recently also.

What does start over actually mean?

For Slayer/SWAT etc where only the win plus kills/deaths matter, does that mean all our KDs will be reset to zero.

For CTF, for example, because that 50 will be all about flag caps, assists, carrier kills etc,does that mean all our stats and CTF KD will be reset to zero?

And so on for any other game type that might be part of the CSR system.

Any thoughts on the above would be appreciated.