Looks like TiVo is quietly rolling 8.3 out to a few select customers. Expect a full rollout (with priority registration?) in the near future. The build message reads:
We just upgraded your Tivo service with the Spring 2007 Service update. This update includes more options for programs in your Now Playing list and integrates support for TivoCast content.
MORE OPTIONS
When viewing the program screen for any recording, you’ll now notice a “More Options” menu item. From here you’ll be able to schedule additional recordings including the option “Get a Season Pass”.TIVOCAST
You’ll now see logos for TivoCast partners making it easy for you to ID the source of your broadband video at a glance.Enjoy!
I assume there are also some tweaks and bug fixes under the hood. As to what happened to 8.2, your guess is as good as mine… perhaps we’re only using odd increments this year.