Avast's changes its design and its color scheme. While the paid versions retain a dark theme, Avast Free goes back to basic white. The interface across all four versions is now much simpler, with big tiles and easier-to-reach advanced settings.
An unusual move for Avast 8 was to include a remote access feature. The implementation sounds weird, too, with both computers required to have some version of the suite. A Web console would be better for easy access.