Disclaimer: You brick your phone doing this, don’t blame me. I’m just letting you know you can do this, not telling you that you should.
That being said, if you’re feeling saucy and want to download the latest version of Android for the EVO now instead of waiting until it rolls out naturally, you can do it. You just have to download the update directly from HTC, and do some magic with recovery mode and your SD card. You can get the full instructions from here.