So all i did was replace the android_info.txt and the recovery.img in his zip, with the ones for our device. I just tried it, and it worked! i have Superuser access in the new 1.55.531.3 ROM.
1. Download the 2 attached files, put them both on the root of your sdcard, and rename the CWM_HBOOT.zip to PG59IMG.zip.
2. Boot into the bootloader however you prefer, let it read the PG59IMG.zip, and press volume up to update when prompted. When it finishes, it will prompt you to press Power to reboot.
3. Now boot into recovery however you prefer, and it should be ClockworkMod(I used the Modaco 126.96.36.199 version, basically because i had it conveniently lying around in .img format. I'm sure Rom Manager could now be used to flash the latest 188.8.131.52 version of CWM). Choose 'install from sdcard', then 'choose zip from sdcard', then choose the Superuser-3.0.7-efgh-signed.zip and choose 'yes'. As has happened in the past, i had to flash it 3 times until it successfully installed. But it did work.
4. Choose to reboot, and enjoy root access on the latest stock ROM!
I figure a lot of people probably won't need all that instruction, but i included it for people who are newer to flashing stuff thru the HBOOT and CWM. I also figure that the user base for this will probably be very small, as most folks who are S-OFF probably are not choosing to run the stock ROM. But anyway, if you DO have S-OFF, i wanted you to know that you can have root access on the latest update. I figure this will also enable us to make nandroid images of the new ROM, if that would help development at all.
Anyway, here are the 2 files:
-This worked for me and should work for you, but use at your own risk.
-You must be S-OFF to do this.
-Hopefully this is only a temporary solution for those with S-OFF, until either Team Revolutionary cracks the update, or HTCDEV fixes whatever is preventing their bootloader unlocker tool from working on our device.