Mailing the story:
Rhythmbox Confirmed As Default Music Player In Ubuntu 12.04 Precise Pangolin
In an Ubuntu-Desktop mailing list message, Jason Warner (Ubuntu Desktop Manager) has confirmed that Rhythmbox will be the default music player in Ubuntu 12.04 Precise Pangolin, replacing Banshee. But there's something even more interesting regarding the default application selection in Ubuntu 12.04: Jupiter Applet might also be included by default as a way to solve power issues.