Diablo 3 release date
Diablo III Toolbar:
The basics haven't changed, the mana and health spheres have become iconic to Diablo games and have been included in Diablo 3 as well. However, gone is the quick potion menu, in its place is the quick menu for skill/spell selection. The orange line near the bottom is the experience bar and hasn't been changed from previous Diablo games. Gone however is the stamina bar. I never liked that thing anyways, who wants to walk when you can run.
Game features are included or excluded from demos depending on what the development team wants to show off at that point. For instance, Runestones were in the 2008 demo, but they were only enabled for Wizard skills. Runestones were not included in the 2009 demo at all since they were under heavy remodeling, but they were a major feature in the 2010 demo, though only for the Wizard, Witch Doctor, and Barbarian.