today I had the same question and found this unanswered discussion.
So here's what I did, it may help others:
(config)#no boot system
(config)#boot system bootflash:cat4500-e-ios-promupgrade-150-1r-SG10
(config)#boot system bootflash:cat4500e-universalk9.SPA.03.06.02.E.152-2.E2.bin
BOOT variable = bootflash:cat4500-e-ios-promupgrade-150-1r-SG10,12;bootflash:cat4500e-universalk9.SPA.03.06.02.E.152-2.E2.bin,12;
CONFIG_FILE variable does not exist
BOOTLDR variable does not exist
Configuration register is 0x2102
Standby BOOT variable = bootflash:cat4500-e-ios-promupgrade-150-1r-SG10,12;bootflash:cat4500e-universalk9.SPA.03.06.02.E.152-2.E2.bin,12;
Standby CONFIG_FILE variable does not exist
Standby BOOTLDR variable does not exist
Standby Configuration register is 0x2102
#redundancy reload peer
! when the peer is online again
#redundancy force-switchover#This will reload the active unit and force switchover to standby[confirm]
! when the entire system is up again
(config)#no boot system bootflash:cat4500-e-ios-promupgrade-150-1r-SG10
Basically what you'd do for a 'normal' IOS-update, just with an additional entry for the promupgrade first in the boot loader.
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