Correction: No, he didn't. I chatted with him, and he pushed cTSOClientLoginRegulator::HandleLoadAvatarResponse onto the messagequeue. That's why he didn't post an official announcement on niotso.org yet, but he's working on figuring out the sequence of packets.
Judging by the message, obviously the packet sent by the server has something to do with avatars. I'm guessing it's
TransmitCreateAvatarNotificationPDU.
More interestingly, the genious (I think we can all agree on that one, by now) managed to make a patch to have the client generate a packetlog, which means that a lot of the packets (not all of them) are now documented
here.
There are still a lot of unknown fields though (unknown as in their purpose hasn't been discovered), which is probably one of the reasons he's yet to figure out the right sequence of packet(s).
I should add that normally, I'd be halfway into a server emulator at this point, but due to the technical uncertainty of such a project, I'm still waiting this one out to see what Fatbag can come up with. From what I understand, he still intends to continue with NIOTSO, but he's a perfectionist (too much of one, if you ask me), and won't give up until he's in the lot screen so that he can create a "pixel perfect" rendition of all screens...