There's no way to stick this in my sig, but according to Sprint's representatives, the CHECKIN method (dialing *#*#checkin#*#* on the dialer) won't work. This update is coming from Google themselves, not Sprint so it's not possible for a customer to initiate it.
Google is making sure the update will release slowly so as to check for feedback make sure they don't get overloaded. My guess is they don't want a repeat of 4.0.3 where they rushed it out and a lot of people got hit with showstopping bugs.
Boo.
Thanks for the info.