This OTA is interesting. Though it includes no firmware update (i.e. radio, PRI, NV, WiMax), it does include Sprint's new "Connections Optimizer" which is supposed to help with battery.
Something else it includes (which I found unexpectedly) is the patent-abiding new App Associations screen (anyone that pre-ordered an EVO 4G LTE knows all about this). So it does appear that HTC is rolling out an update to all devices to "correct" this issue.
First off, keep in mind this is the straight OTA file - it has not been rooted or otherwise touched. If you're running stock, unrooted, and want to apply it, you can save it to the root of your SD card, and rename it "update.zip". Then boot into Recovery from the bootloader (disable "Fast boot" under "Applications", power device all the way off, and then hold volume down button while powering on until HBOOT appears. then choose "RECOVERY" option). When you see the phone with the red triangle & exclamation point, press both volume buttons and the power button at the same time. Some yellow error text should appear first (ignore that), and wait a few seconds until the menu appears. Use the volume buttons to select the apply update zip option, and then navigate to the file. Press the Power button to apply.
NOTE: I've only been using this OTA for a few minutes, and my phone keeps hot rebooting. I wonder what's up with that?
EDIT: If you want the full ROM, stock & rooted, based on this OTA, get it here.
EDIT 2: If you want the new kernel from this OTA, get it here.