B733 FLC RECEIVES CONFLICTING C90 APCH INSTRUCTIONS.

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AS WE WERE APCHING ORD ON OUR FIRST CONTACT WITH APCH CTL ON THE ARR OVER BEARS INTXN; WE WERE TOLD TO EXPECT RWY 27L VISUAL APCH. AFTER BEING CLRED TO A LOWER ALT AND VECTORED AND SLOWED; WE WERE TOLD WE WERE NOW GOING TO BE GOING TO RWY 27R. THEN WE WERE HANDED OVER TO THE FINAL APCH CTLR WHO GAVE US A HDG TO INTERCEPT THE FINAL APCH COURSE; WHICH WE ASSUMED WAS RWY 27R; DUE TO THE INSTRUCTIONS OF THE PREVIOUS CTLR. WE WRE IN A VERY HIGH WORKLOAD SIT DUE TO THE PREVIOUS RWY CHANGE. WELL; AS IT TURNED OUT; OUR NEW CTLRS KNOW NOTHING ABOUT THE PREVIOUS CTLR'S INSTRUCTIONS. WE QUERIED THE CTLR AGAIN AND HE SAID WE HAD ALWAYS BEEN GOING TO RWY 27L (WHICH WAS NOT TRUE. AT ANY RATE; WE CORRECTED BACK TO THE CTRLINE OF RWY 27L AND CONTINUED AN UNEVENTFUL VISUAL APCH AND LNDG. THERE WERE A NUMBER OF FACTORS HERE. BRIEFING AND SETTING UP FOR THE NEW APCH AS PREVIOUSLY INSTRUCTED; VISUAL APCH AND LOOKING FOR TFC MULTIPLE CTLR AND FREQ CHANGES AND RAPID FIRE CLRNCS. ALSO; THERE WAS AN EXPECTATION THAT WE WERE NOW GOING TO RWY 27R AS INSTRUCTED BY THE PREVIOUS CTLR. FORTUNATELY; THERE WAS NO LOSS OF SEPARATION AND WE WERE IN VMC AND ABLE TO CORRECT FOR WHAT WE BELIEVE WAS AN EXAMPLE OF POOR COM BY ATC.