iPhone there's a slew of new fixes and tweaks available. On both platforms, the Facebook login has been streamlined, there's To Do List / Season Pass management for Series3 DVRs, ability to create a WishList search and more. The iPad version features a new full-screen Browse UI (shown above) and collapsible folders while the iPhone receives high res retina display quality images. Zatz Not Funny mentions those higher quality pics will come to the iPad as well in the next few weeks, while TiVo's blog post mentions all of these features will arrive in its Android app(s) this summer. We say apps plural, because that's including a specialized Tablet version due in the springtime. For now however, the changelogs for the iOS versions are available at the links below.
Update: Just an FYI, the official TiVo app for Android has also been updated, adding support for more resolutions, an exit button in the menu and unspecified performance and stability fixes.