You could always try calling the carrier you're with and asking for a possible ETA. If you have an un-rooted, standard, over the counter, unmodified cell phone the update would be delivered to you via the carrier and you could then choose to download via WiFi or over your cell network.
When the new versions of android are released they are sent to the carrier first, so that they can make their changes to it. That's why you get all that bloatware, with Bell up here in canada for example you get a mobile tv app and an app to see your account information. They're considered system apps so you can't remove them unless you have a rooted phone.
Keeping in mind that the carriers get the software first, they'd be the best to ask for an ETA...