AN A320 CREW'S APPROACH TO ORD RUNWAY 28 BECAME UNSTABLE BECAUSE THEY WERE HIGH AND FAST AT THE UNANTICIPATED VISUAL APPROACH'S START.

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CLRED FOR VISUAL APCH RWY 28 BEHIND B757; WE WERE AT 6500 FT. ON DOWNWIND AT ABOUT 6200 FT; FO (PF) SLOWED; CALLED FOR FLAPS 1 DEG; TURNED IN FOR INTERCEPT ABOUT WILTT WITH FULL SPOILERS EXTENDED; HAND-FLYING AS BRIEFED. FLAPS 2 AND 3 DEGS WERE CALLED FOR AND EXTENDED. STILL FAIRLY HIGH; I SUGGESTED GEAR; WHICH FO CALLED FOR; AND WHICH WAS EXTENDED; ACCOMPANIED BY BEFORE LNDG CHKLIST. TURNING ONTO FINAL; AND SLIGHTLY INSIDE WILTT; GOT 'SPD; SPD' WARNING TO WHICH FO RESPONDED WITH TOGA THRUST. GETTING LOW ON GS; I ASKED IF HE WAS DONE WITH THE SPOILERS; AT WHICH TIME HE RETRACTED THEM AND CORRECTED FOR DSCNT. THE FACT THAT THE ACFT WAS NOW IN GA MODE AND WE WERE SO CLOSE PRESENTED SOME DIFFICULTIES; BUT WE HAD BRIEFED APCH SPD; WHICH WAS SELECTED ON FCU. STILL LOW BUT ON PAPI AND SLIGHTLY SLOW; ACFT WAS STABILIZED BY 500 FT IN CLR; VFR CONDITIONS; SO I ELECTED NOT TO CALL FOR GAR. ACFT LANDED NORMALLY. FIRST DAYTIME SLAM DUNK TO RWY 28 FOR ME; SO I WAS PROBABLY A LITTLE SLOW ON CUES ABOUT ENERGY STATE OF ACFT. SUPPLEMENTAL INFO FROM ACN 813157: I GET A 'SPD; SPD' WARNING FROM THE ACFT WARNING SYS. I DISCONNECT THE AUTO THROTTLE AND PUSH THE PWR UP INADVERTENTLY ACTIVATING TOGA. I PULL THE PWR BACK AND TELL THE CAPT NOT TO WORRY ABOUT RESETTING THE BOX AS I AM FLYING VISUALLY. WE SOON REALIZE THE SPD WARNING IS DUE TO INADVERTENTLY LEAVING THE SPD BRAKES DEPLOYED. I BELIEVE I FELL BEHIND ON THE APCH; DUE TO BEING UNPREPARED FOR THE VISUAL FROM SUCH A HIGH FAST START AS WELL AS TRYING TO PICK UP THE TFC DURING THE HIGH WORKLOAD START OF THE APCH. THIS APCH WAS VERY UNUSUAL TO GET FROM A NORMALLY HIGHLY REGULATED ORD APCH. I DON'T KNOW IF THE NEW RWY OPENING IS CREATING NEW FLOW OPPORTUNITIES; BUT IF SO CREWS NEED TO BE READY FOR UNEXPECTED CLRNCS UNTIL NEW PATTERNS EVOLVE. I WAS NOT READY TODAY; BUT WILL BE TOMORROW.