Looks like the rumors were true. Several HTC EVO 4G LTE owners are reporting that they're now downloading the 3.15.651.16 update for their handsets, which includes a bump up to Android 4.1.1 Jelly Bean. The update weighs in at 396.78MB, and according to Sprint's update changelog, included is HTC Sense 4+, improved browser performance, enhancements to Google apps like YouTube and Gmail, and a better gallery. Sprint's full changelog is as follows:

• WiFi authentication Improvement
• Personalized ringtones
• Calendar event description hyperlinks and calendar reminder improvements
• Addition of Sprint Connections Optimizer
• Upgrade to Android 4.1.1 (Jelly Bean) with HTC Sense 4+
  • Improved browser performance
  • Face Unlock improvement
  • Application improvements to YouTube, Google+, Gmail, Maps, and more
  • Improved camera including Auto Portrait and Sightseeing Mode capabilities
  • Improved gallery with ability to display photos and video albums according to when or where taken
  • Tap and Go function to connect the phone to select Beats Audio speakers
  • HTC Get Started support to allow device set up from a computer

Sprint says that updates may be released in stages, but yesterday's leak mentioned that customers could initiate the Jelly Bean goodness themselves today, so it might be worth trying a manual install if you've got a EVO 4G LTE lying around. This can be accomplished by going into Settings > System updates > HTC software update > Check now. Be sure to give us a shout in the comments below once you get Jelly Bean up and running, EVO 4G LTE owners!

Via Sprint, Android Police, Android Central forums