There are several noteworthy changes:
- The sizes of all the fonts and buttons were increased
- The “selected” item or item with the mouse over it is clearly highlighted
- The user can navigate intuitively around the page using D-pad up/down/left/right motions
- Additional padding has been added between all elements on the page
- Darker or slightly muted colors have been chosen to suit TVs that are generally tuned to be brighter
More on Google’s Designing / tweaking your website for TV guide.