If you don't want to wait for the OTA notification you can already flash latest system dumps. For more details please visit my XDA thread.
If you are a power user and a custom ROMs flasher, you can also grab the latest Android Revolution HD based on the 2.22.401.4 update with many extra goodies under the hood.
Finally, if you only want to root your device and keep the rest stock, feel free to visit my XDA thread with a special rooting tools.
All above files can be accessed via Downloads Page on my blog.
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