This RUU was released by HTC the other day and there was a link on their HTC Inspire website, but it was pulled right away. So I am not sure if this will be the final version or not, but there is a link right from HTC's website below. In the event you do intall this RUU and it is updated on the "final" or actual release, I believe you might have to make a Goldcard and downgrade to 2.2.1 and then upgrade from there. I installed this RUU last weekend when it was leaked and I have had no issues. Has worked great.
Manual system update instructions:
NOTE: Performing the system update manually will delete all information from the device. Ensure all information is backed up before proceeding. Information saved on the microSD card will not be affected.
Performing the ROM Update:
Download and save the HTC Inspire 4G™ for AT&T Gingerbread ROM update to your PC.
Connect your device to your PC via the supplied USB cable. NOTE: You must have HTC Sync installed on your PC in order to run the update.
On the Connect To PC pop-up on your device, select HTC Sync.
Once connected to HTC Sync, locate the HTC Inspire 4G™ for AT&T ROM Update that you downloaded and double-click on the file to launch the system update wizard.
Follow all of the system update wizard instructions shown on your PC.
Once the update is complete, click Finish in the Wizard and the device will reboot.
Once the device reboots, the initial setup wizard will appear.
Once the initial setup process is complete, the device is ready for use.
http://dl4.htc.com/RUU_Ace_Gingerbr...60.25_26.10.04.03_M_release_200368_signed.exe