MLG HAS NMAC AS BREAKS THROUGH OVCST AT 800 FT.

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RPTED WX AT EWR OVCST WITH 5 MI HAZE. INFLT VISIBILITY 2 MI WITH OBSCURED CEILING AT APPROX 800-900 FT AGL. WE WERE HANDED OFF TO THE LCL CTLR ON AN 8 (APPROX) MI FINAL FOLLOWING A COMMUTER MDT BY 3 MI AT 170 KIAS. AFTER CHKING IN; WE HEARD TWR INSTRUCTING A TWIN SMT TO GAR AND EXECUTE A L TURN FOR A VISUAL LNDG ON RWY 29. SINCE WE WERE STILL IMC; WE BEGAN TO DISCUSS THE POSSIBILITIES FOR A POTENTIAL CONFLICT. TWIN SMT ACKNOWLEDGED THE L TURN AND (MISTAKENLY) VISUAL CLRNC TO RWY 19. BEING FAMILIAR WITH THE NEWARK ARPT; WE QUICKLY SURMISED THAT THE TFC WAS DEFINITELY UNFAMILIAR WITH THIS HEIGHTENED OUR SITUATIONAL AWARENESS. UNFORTUNATELY; WE WRONGLY ASSUMED THAT THE TFC WAS MORE OF A POTENTIAL CONFLICT TO THE MDT AHEAD OF US. I WAS HAND FLYING THE ACFT ON THE APCH AND FO WAS MONITORING AND SEARCHING FOR TFC. TWR ADVISED SMT OF MDT TFC ON FINAL TO RWY 22L AND APPARENTLY SMT THOUGHT HE WAS TO FOLLOW MDT TO 22L. AS WE BROKE OUT OF THE OVCST; THE FO CALLED TFC AT 9 O'CLOCK AND CLOSING. BEFORE EVASIVE ACTION COULD BE TAKEN; TWR ORDERED US TO GAR. FORTUNATELY; SMT SAW US AND EXECUTED AN EVASIVE R TURN. UNFORTUNATELY; HE TURNED OUT ON THE FINAL APCH COURSE AND FORCED AN AIRPLANE BEHIND US TO ALSO GAR. THE TWR CTLR LATER STATED TO ME THAT THE SMT COULD NOT PERFORM THE PUBLISHED MISSED APCH DUE TO TFC DEPARTING RWY 22R. TWR SHOULD NOT HAVE TRIED TO SALVAGE SITUATION IN MVFR. SMT PLT SHOULD NOT HAVE TRIED TO SALVAGE SITUATION IN MVFR. MISSED APCH PROCS ARE ESTABLISHED FOR A REASON AND POTENTIAL FOR TFC CONFLICTS ARE INCLUDED. TWR SHOULD HAVE INFORMED US OF TFC INSTEAD OF LEAVING IT UP TO US TO FIGURE OUT. THE FACT THAT WE WERE NEVER WARNED OF A POTENTIAL CONFLICT HELPED US TO ASSUME THAT WE WOULD NOT HAVE ONE. THIS WAS TOO CLOSE AND UNFORGIVABLE AT A MAJOR ARPT.