http://mozillalinks.org/wp/2008/02/a-de ... -3-beta-3/
according to this, there are plenty of new visual updates, and the new Forward/Back button seems familiar...

http://www.mozilla.com/en-US/firefox/3. ... easenotes/
this is Mozilla's version of the above link, so it may seem more like an advertisement than anything. They also seem to talk about many "new" updates to the browser that were new in beta 2.
If anyone's downloaded this yet, go ahead and give your opinion of it.