I was passing by on my way from the One X+ Forums, and I recently got confirmation from this wonderful man that my phone would be receiving the 4.2.2 update by the end of the year.. While browsing through his Twitter feed, I came across this tweet from him, which at least confirms that a plan is being worked out to release the same update for you guys. That is the same response he gave about the One X+ not too long ago, but now that has been confirmed, so I would expect a full confirmation soon for the EVO. It looks like you guys haven't been forgotten after all.
Update 1: I contacted him directly about it, and got a slightly different and more vague response here. He won't confirm anything, but he says he is "working on it", so take it for what you will. I still believe it will receive the update, although @Fifth313ment is willing to bet $100 that it won't.
Update 2: We've got an official comment from the President of HTC USA here. It's still very vague, but it looks like we'll be hearing about a possible update plan soon.
Update 3: It's official folks! https://twitter.com/JasonMacHTC/stat...84246521769984 And it's a version newer than most were even expecting! I believe @Fifth313ment owes me a healthy chunk of money and an apology to HTC. ;D
Update 4 (11/26/13): It looks like the update is still on track for the end of the year, but a delay is not out of the question. It is in internal lab testing right now though. https://twitter.com/JasonMacHTC/stat...22654338777088