Thought I'd chime in here:
Evo 3D root exploit
might be close. Given that both E3D and E4G Roms are GB Sense 3, the hole might be applied to both phones. And as I also confirmed today, any phone with a leaked ENG bootloader can be fully rooted, regardless of how secure the existing bootloader is. All you need is that exploit to get temp root access. From there, you simply flash the ENG bootloader over the original one. Full root.
So... it's looking pretty good that E3D will be fully rooted. HTC's bootloader-unlock OTA is looking less relevant. And any positive development for E3D will be good news for people with stock E4G with GB waiting for root.
UPDATE: Maybe not. Developer that found the exploit for Evo 3D just got off an IRC session where he explained that the exploit may not apply to Evo 4G. See the transcript of the chat here:
http://androidforums.com/evo-3d-all...dev-agrabren-describing-new-root-exploit.html