B757 FLT CREW IS CONCERNED WITH ATC TAXI PROCS AT PHX.

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AFTER PUSHBACK; PHX GND CLRED US TO 'TAXI RWY 25R AFTER INBOUND ACR W VIA TXWY E. THE SUN HAD SET; AND IT WAS DARK. WHILE TAXIING WE HEARD AN ACR Z FLT RPT APCHING SPOT 'S.' WE DID NOT SEE ANY FLTS ANYWHERE NEAR SPOT '3;' AND ASSUMED THE FLT WAS STILL AT THE GATE OR SOMEWHERE ELSE ON THE ARPT. NEARING TXWY E12; WE SWITCHED TO TWR FREQ AND SHORTLY HEARD ACR Z-1; 'CLRED FOR TKOF RWY 25R.' WE THEN NOTICED AN ACR Z-2 AT TXWY D13 MOVING TOWARD THE RWY; AND BRAKED TO AVOID POSSIBLE CONFLICT WITH HIM. THEN WE SAW THE OTHER ACR Z-1 FLT MOVING AT A VERY HIGH RATE OF SPD APPARENTLY ON TXWY R HEADED FOR RWY 25R. I WOULD ESTIMATE HIS SPD TO BE 30-40 KTS AS HE PASSED THE FIRST ACR Z-2 NOW SLOWING ON D13. OUR CLRNC WAS TO TAXI TO THE END OF THE RWY; NO OTHER TAXI TA'S WERE GIVEN; AND NO YIELDS ISSUED. IF WE HAD NOT SLOWED FOR THE FIRST ACR Z-2; AND CONTINUED AS PER OUR INSTRUCTIONS; WE COULD HAVE COME VERY CLOSE TO COLLIDING WITH THE SECOND ACR Z-1 WHO WAS RAPIDLY APCHING RWY 25R AND BEING SCREENED BY THE FIRST ACR Z-2. TWR THEN CLRED THE SECOND ACR Z-1 FLT FOR TKOF. I SURELY DO NOT UNDERSTAND THE TKOF ORDER ASSIGNED BY PHX TWR AS WE HAD CALLED FOR TAXI AT LEAST 7 MINS PRIOR TO REACHING THE RWY. I PARTICULARLY DO NOT UNDERSTAND THE NEED TO CHANGE THE RWY AS IF IT WERE A CONTEST. AND I CANNOT EXPLAIN WHY WE WERE NEVER TOLD BY THE GND CTLR OR TWR TO HOLD SHORT OF TXWY E13; SO THAT WE COULD AVOID POSSIBLE CONFLICT WITH 2 OTHER ACFT. AGAIN; WE WERE NEVER WARNED TO HOLD SHORT OF TXWY E13 OR OF THE 2 ACR Z ACFT WHO WERE THEN CLRED FOR TKOF PRIOR TO US.