FK10 CREW LANDED ON THE WRONG RWY AT PHL.

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WE CAME OUT OF 2 LINES OF WX NEAR THE BUNTS INTXN WHILE TRANSITIONING FROM ZNY TO PHL APCH CTL. DUE TO A HIGH COCKPIT WORKLOAD; WE DID NOT CATCH THAT PHL WAS LNDG RWY 27L RATHER THAN THE USUAL RWY 27R (ON THE ACARS ATIS). WE BRIEFED AND SET UP FOR THE ILS TO RWY 27R. WE WERE GIVEN NUMEROUS VECTORS WHICH CONCLUDED WITH A TURN TO 250 DEGS TO INTERCEPT THE LOC. SHORTLY THEREAFTER; WE WERE CLRED FOR THE APCH. I DO NOT RECALL THAT THE CTLR SPECIFIED ILS RWY 27L. HE THEN TOLD US TO CONTACT THE TWR AT THE MARKER. WE CALLED THE TWR AT SPEEZ INTXN. THE TWR SAID '#3; CONTINUE.' TWR THEN CLRED US TO LAND WHEN WE WERE AT 1000 FT. WE LANDED ON RWY 27R; TAXIED CLR AND WENT TO THE GATE. WE GOT A MESSAGE TO CALL THE TWR BY PHONE. THERE WAS NO TFC CONFLICT. OUR USUAL LNDG RWY IN PHL IS RWY 27R. VERY SIMPLY PUT; NEITHER WE NOR THE CTLRS CAUGHT THAT WE WERE LINED UP FOR; AND LANDED ON; THE WRONG RWY. SUPPLEMENTAL INFO FROM ACN 465605: WE SET UP COCKPIT AND BRIEFED THE RWY 27R APCH AND FOLLOWED IT DOWN ON LOC; OR AUTOPLT; TO LNDG. WE WERE CLRED BY APCH TO FLY 250 DEGS TO INTERCEPT THE LOC. SHORTLY AFTER; WE GOT CLRED FOR THE ILS (TO THE BEST I CAN REMEMBER HE DID NOT SAY WHICH RWY). WE WERE TOLD TO CONTACT TWR OVER MARKER AND AGAIN HE DID NOT GIVE US THE NAME BECAUSE I LOOKED AT APCH PLATE TO MAKE SURE IT WAS SPEEZ INTXN. WHEN WE CHKED IN; ALL TWR SAID WAS #3 AND TO CONTINUE APCH. AT 1000 FT WE WERE CLRED TO LAND AND I DO NOT REMEMBER IF HE SAID RWY 27L OR JUST CLRED TO LAND. WE LANDED ON RWY 27R WITH NO TFC CONFLICTS AND PROCEEDED TO GATE. THE BOTTOM LINE IS WE DID NOT CATCH THE CHANGE IN RWYS AND APCH AND TWR DID NOT EITHER BECAUSE WE WERE CAPTURED ON THE R SIDE'S LOC ON AUTOPLT TO 500 FT AGL.