TiVo has started rolling out the 8.3 update for Series2 units. If you want it faster, sign up for the priority list. Series3 units will have an update soon.
A couple of other tidbits to share.
If you're trying the TiVo Desktop 2.4 for Windows Preview Release, there is a feedback forum here.
Also, if you're still using a phone line with your TiVo (you really want to use broadband if you can), it looks like the pool of available numbers shrank on March 1st. You may need to change the dial-in number your TiVo is using if it has had problems connecting.
And don't forget to vote for TiVo. Currently in second place, after the Slingbox Pro.