There is a tweet from today from the AOS, in response to folks wondering when the update would be. This is the response.
"Hopefully soon! The volunteer who generally gets them uploaded is having a busy summer. Thank you for your patience, and keep checking back!"
But yeah, I have been checking religiously, as I am currently making some taxonomic tweaks to me own checklist and would like to have that update in hand to incorporate changes. Also, I believe IOC is waiting on NACC as well. I suspect the updates would be a lot easier if they did the SACC method of just posting as decisions are made or the system IOC makes, where they just change the checklist and makes notes in the update tables.