There's a thread over at The Brown Site (XDA). I'm surprised that there isn't mention of it here. It looks like the Sunshine gang, primarily Beaups, unlocked the bootloader on his Droid Turbo running the latest OTA (Build SU4TL-44/System version 23.21.44). Jcase says testing is ongoing. It's in the General section. I can't remember if it's okay to link to other forums, so....if I shouldn't, let me know.