Blizzard has released updated system specs for Diablo 3. Check them out below:
PC
OS: Windows® XP/Windows Vista®/Windows® 7 (Latest Service Packs) with DirectX® 9.0c
Processor: Intel Pentium® D 2.8 GHz or AMD AthlonTM 64 X2 4400+
Video: NVIDIA® GeForce® 7800 GT or ATI Radeon™ X1950 Pro or better
Mac
OS: Mac® OS X 10.6.8, 10.7.X (Latest Version) | Processor: Intel® Core 2 Duo
Video: NVIDIA® GeForce® 8600M GT or ATI Radeon™ HD 2600 or better
All Platforms
HD Space: 12 GB available HD space | Memory: 1 GB RAM (1.5 GB required for Windows Vista®/
Windows® 7 users, 2 GB for Mac® users) | Drive: DVD-ROM drive | Internet: Broadband Internet
connection | Display: 1024x768 minimum display resolution
(Note: Be advised that some wireless connections do not meet the minimums required to be a true Broadband Internet connection. Wireless results may vary.)
PC
OS: Windows Vista®/Windows® 7 (Latest Service Packs) | Processor: Intel® Core 2 Duo 2.4 GHz
or AMD AthlonTM 64 X2 5600+ 2.8 GHz | Memory: 2 GB RAM | Video: NVIDIA® GeForce® 260 or
ATI Radeon™ HD 4870 or better
Mac
OS: Mac® OS X 10.7.X (Latest Version) | Processor: Intel® Core 2 Duo | Memory: 2 GB RAM
Video: NVIDIA® GeForce® GT 330M or ATI Radeon™ HD 4670 or better
Blizzard has announced at Blizzcon that if you buy a 1 year subscription to their popular MMO, you will receive the full Diablo 3 for free, to keep. With 1 year costing more than $140, this would really only make sense if you really wanted to play World of Warcraft for a year anyway.
The only other thing of note they announced was the new box art. You can see the result of their development effort below.

We have access to the beta and will be streaming every day at Twitch TV. You can always check the Stream Tracker for live Diablo 3 streams.