[Thanks to everyone who sent this in]
Update: The full text of the update is "This system update from Google contains important bug fixes plus the latest version of Maps." It's 1.9MB -- so yeah, don't expect much!
Update 2: By the way, it appears that the "checkin" trick is actually working to force this update (it usually doesn't). Just dial *#*#checkin#*#* from the dialer and you should get the update notification. Have fun!