Sprint is rolling out an OTA update for the HTC EVO 3D right now, bumping it up to version 2.17.651.5. Now before you ask: no, this isn't the highly anticipated Ice Cream Sandwich update. Rather, the changelog is rather short, only including some unknown "Security Update." (Could this be the fix for that ugly WiMAX security bug uncovered by TrevE last October?)
Some other news outlets are reporting that this update also includes battery life improvements and an updated Peep client that aligns better with Twitter, although this isn't confirmed on Sprint's site.
To check and see if this update is available for you, just hit Menu > Settings > System updates > HTC software update. Since I'm running Fresh on my rooted EVO 3D, I'm not taking this update quite yet. But if you do, be sure to let us know how it's working out for you, and whether or not you notice any other improvements.