CAPT OF AN LGT ACR ACFT INADVERTENTLY TAXIED PASSED THE HOLD SHORT LINE DUE TO NOT BEING INFORMED BY THE FO THAT TWR HAS CHANGED THEIR INTENDED TKOF RWY.

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RWY 9L WAS OUR ASSIGNED TKOF RWY. OUR POS WAS #1 AT THE HOLD SHORT. THE ACFT AHEAD OF US WAS CLRED FOR TKOF WITH AN ACFT INBOUND ON A AN 8 MI FINAL. THE FO RECEIVED AND ACKNOWLEDGED A CLRNC FOR A RWY CHANGE TO RWY 12; 'POS AND HOLD.' NEITHER MYSELF NOR THE FE HEARD AND/OR MENTALLY REGISTERED THE RWY CHANGE. AS I WAS PREPARING MYSELF FOR AN IMMEDIATE TKOF (NOTE: THE INBOUND ACFT; NOW ON A 5-6 MI FINAL) I INITIATED TAXI ONTO RWY 9L. THE FO DID NOT NOTICE THE DIRECTION OF TAXI AS HE WAS 'HEAD IN THE COCKPIT' TRYING TO RETRIEVE TKOF; V-SPD DATA FOR RWY 12. HE THEN QUERIED ME AS TO THE NEED FOR RWY 12 DATA. AT THIS TIME I STATED WE WERE USING 9L AND HE RESPONDED THAT THE TWR GAVE US RWY 12. I THEN CHANGED MY DIRECTION OF TAXI; HAD THE FO VERIFY THE CLRNC; AND TKOF ON RWY 12 WAS UNEVENTFUL. ALTHOUGH I DID TAXI ACROSS THE HOLD SHORT LINE FOR A SHORT DISTANCE; WE DID NOT COME CLOSE TO PENETRATING THE RWY 9L EDGE LINE AS THE DISTANCE FROM THE 2 IS RATHER LENGTHY. TO PRECLUDE THIS FROM HAPPENING AGAIN; MY RECOMMENDATIONS: 1) ACFT SHOULD NOT BE GIVEN A LAST MIN RWY CHANGE WHEN AT THE HOLD SHORT FOR THEIR PREVIOUSLY ASSIGNED RWY. 2) IF A RWY CHANGE IS TO BE MADE; MORE FOREWARNING SHOULD BE GIVEN. 3) MOST CERTAINLY; A RWY CHANGE AND A POS AND HOLD CLRNC SHOULD NOT BE ISSUED TO PLTS IN THE SAME XMISSION BUT N 2 INDEPENDENTLY ACKNOWLEDGED XMISSIONS. 4) IN A MULTI PERSON COCKPIT THE CREW MEMBER RECEIVING A RWY CHANGE ON THE RADIO EITHER FOR TKOF OR LNDG ENSURE THAT THE OTHER MEMBERS OF THE CREW UNDERSTAND SAME.