Apparently, the pulseaudio-3.0 package needs a dependency from libpulse0 >= 3.0 (the current dep is only libpulse0 >= 0.99.4). After installing libpulse0-3.0-1 manually, my pulseaudio worked again.
$ apt-cache policy pulseaudio libpulse0 pulseaudio: Installed: 3.0-1 Candidate: 3.0-1 Version table: *** 3.0-1 0 1 http://ftp2.de.debian.org/debian/ experimental/main amd64 Packages 100 /var/lib/dpkg/status 2.0-6.1 0 500 http://debian.tu-bs.de/debian/ wheezy/main amd64 Packages 1 http://ftp2.de.debian.org/debian/ sid/main amd64 Packages libpulse0: Installed: 3.0-1 Candidate: 3.0-1 Version table: *** 3.0-1 0 1 http://ftp2.de.debian.org/debian/ experimental/main amd64 Packages 100 /var/lib/dpkg/status 2.0-6.1 0 500 http://debian.tu-bs.de/debian/ wheezy/main amd64 Packages 1 http://ftp2.de.debian.org/debian/ sid/main amd64 Packages -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org