This has been mentioned various times on here - not least because of the extravagant 'completion' date.
http://www.edinburgh.gov.uk/download/downloads/id/1893/edinburgh_waterfront_promenade_design_code
Of course large sections already exist - at each end.
There are also various piecemeal bits in between.
Perhaps there should a CCE study tour one day (or two). Cramond to the Haven Cafe then, the rest.
Today I happened to be down at Granton. There are some (maybe) connecting bits - with various degrees of accessibility.