An XDA member posted a leaked test version of the official Gingerbread ROM for the Sprint HTC Evo that is supposed to come out soon. This version is a rooted version of what they believe is the official HTC update for the Evo. Nothing has been changed besides adding root access, so this is what you would have if you waited for the OTA (just without the waiting part). Now this not a signed version, so you must still be rooted in order to flash this ROM. Head to the source link at the bottom of the post though to download the ROM and please do a Nandroid backup in recovery before flashing it, just in case.
Enjoy and feel free to let us know what you think of it in the comments below!