B767 FA REPORTS SMOKE IN CABIN AFTER PASSENGERS HAVE DEPLANED. FA'S EXIT AND CFR IS CALLED.

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BEFORE LNDG; THE PLT INFORMED US THAT THERE WOULD BE A MECHANICAL ISSUE DUE TO A NAV SYS THAT HAD BEEN WRITTEN UP 4 TIMES; AND SHOULD NOT HAVE BEEN ALLOWED TO FLY OVER WATER. AFTER LNDG; THE AGENT; PAX IN THE TERMINAL; AND CATERERS/CABIN SVC PERSONNEL ALL TOLD US THAT WE HAD BLACK AND WHITE SMOKE TRAILING BEHIND OUR R ENG ON OUR DSCNT AND LNDG. THE INBOUND PLTS HAD ALREADY LEFT FOR THEIR LAYOVER. 6 OF THE 7 FLT CREW REMAINED ON BOARD THE ACFT; WAITING FOR THE OUTBOUND PLTS AND WHAT THEY WOULD HAVE TO SAY ABOUT THE AIRWORTHINESS OF OUR ACFT. ABOUT 25 MINS AFTER ALL THE PAX DEPLANED; I STARTED TO SMELL SMOKE. I ASKED FLT ATTENDANT #4 IF HE SMELLED IT TOO; AND HE CONCURRED. WE STEPPED ONTO THE JETBRIDGE TO TALK TO A MAINT MAN; AND WHEN WE WALKED BACK ON; THE FIRST 1/2 OF THE CABIN WAS FILLED WITH SMOKE. A PA WAS MADE TO EVAC THE ACFT. WE EVACED USING THE OPEN BOARDING DOOR AT 1L; EXCEPT FLT ATTENDANT #2 WHO EVACED OUT OF 4R WITH THE CATERING TRUCK THAT WAS THERE. SHORTLY THEREAFTER (WITHIN SECONDS); OUR ACFT COMPLETELY FILLED WITH A DENSE; GRAY SMOKE. THE FIRE DEPT THEN APCHED THE ACFT IN FIRE RETARDANT 'MOON SUITS' TO INVESTIGATE. THE ACFT WAS COMPLETELY FULL OF FUEL. ABOUT 15 MINS AFTER THE EVAC; THE AGENT AT THE GATE INITIATED A GATE EVAC. THE TERMINAL AREA WE WERE AT WAS BLOCKED OFF. EVENTUALLY; THE FLT CANCELED; AND PEOPLE WERE ALLOWED BACK IN THE GATE AREA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER COULD ONLY ADD THAT THE SMOKE CAME ON VERY RAPIDLY AND SMELLED ELECTRICAL IN NATURE. THE COCKPIT FLT CREW HAD DEPARTED THE ACFT EARLIER AND WERE UNAWARE OF THE PROBLEM AND UNLIKELY TO FILE A REPORT.