Unfortunately most of the sound devices out there don't do hardware mixing AFAIK (mostly on-board stuff). For the majority of users, PulseAudio brings the sound experience in line with say Windows 7, where multiple apps can output sound simultaneously, and it's easy to switch devices (ok maybe that's an Ubuntu/Gnome GUI, but still .. it never existed for ALSA). I also never saw ALSA software mixing (dmix?) implemented in Ubuntu or Debian.
No announcement yet.
Blizzard Still Has a World of Warcraft Linux Client