There’s some really nice footage of the Diablo 3 beta up on YouTube, featuring a female Barbarian battling her way through the end of Act 1. The player has done a good job of revealing the spell book at the beginning, as well as demonstrating some of the different class abilities.
You also get a look at one of the new Followers — Kormac the Templar.
The video ends with the final boss fight in Act 1 — The Skeleton King. This fight also happens to be the furthest point to which players can currently progress in the beta.