Since I'm sure plenty of people aren't taking the "missed" OTA news well and are turning to the leaked RUU's ... I wanted to give a quick how to and some of the things to expect, kind of a mini FAQ I guess...Here goes.
Foreword: Backup and data you don't want to lose. If you are unlocked, you will need to lock your phone before running this. You must also use an unencrypted SD Card
Disclaimer: If you follow these steps you are flashing unsupported code on your phone. Understand that the expectations are you understand what you're doing. There are only a few paths back from this and they're all harder than what you're about to read. Droidforums does NOT SUPPORT LEAKED ROMS/RUUs IN ANY WAY SHAPE OR FORM. I have copied this from another forum(my own post) to help ease the issues people are having flashing the leaked firmware/ROM. Droidforums is merely hosting this information, anyone who so chooses to use this information is responsible for their own actions. That being said, let's get down to work.
Step 1) Download the leaked RUU. There are several outlets for this but start at the top I guess
*Updated Link to 6/12/12 leak.
Step 2) Transfer to your phone's SD card
If you downloaded it on your phone, use a file manager to move it to /sdcard2/
If you downloaded it on a PC, connect to your phone and drop is on the external SD(/sdcard/ext_sd)
Step 3) Rename to PH98IMG.zip
This can be done during step 2 but it's important enough to know that this HAS TO BE DONE
Using a file manager, rename your recently downloaded zip file "PH98IMG.zip"
Step 4) Reboot into HBOOT
If you're rooted, you can use an app like quickboot
For everyone else, make sure that fastboot is turned off. Power down your phone. Power up holding Volume down and Power.
Your phone will start updating...
Wait about 15 minutes, if it hasn't rebooted do a battery pull.
Repeat Step 4
Usually the RUU needs to be flashed twice in order to work.
Q: Will running this void my warranty?
Q: Will I be able to get the OTA if I do this?
A: Nobody knows yet. We don't have any real information on the OTA so it's hard to say. However assume the answer is no.
Q: Will I lose all my pictures?
A: See the note above that says BACKUP EVERYTHING YOU DON'T WANT TO LOSE
Q: Will I lose my music?
A: See above
Q: Will I lose XYZ?
A: Really...see above.
Q: Ok, fine... How do I backup my data?
A: Titanium backup, Mybackup Pro, and a good few other applications can do this. Most require root to do a thorough job. Sorry, not much way around it.
Q: Can I go back to the Gingerbread stock ROM after this?
A: Not unless you unlock and use a ROM or S-Off.
Q: I've done the leak and get horrible XYZ.
A: That's not really a question but you should understand that this is not an official update and anything that comes as part of it is by and large unsupported.
Q: I've followed your guide to the letter but when I get into HBOOT nothing happens
A: If your SD Card is encrypted, use a non-encrypted card.