The diablo 3 media & press has begin to receiving beta access.
Here is the official statement from blizzard about diablo 3 beta for press:
1. Start with a small sample audience to test stability
2. Take bug and crash report feedback; act on them quickly
3. Release new patches to make some very necessary changes in the small test environment
4. Keep testing stability while adding new battle.net/infrastructure components
5. If everything is running incredibly smooth after steps 1-4, invite people from the general public to open the flood gates on stress testing and get focused gameplay feedback/bug reports