I first noticed it by seeing new weird entries in pstree and htop. Then I noticed my volume was muted. Further investigation gave me no soundcards found.
I am not sure what caused it, looks like as pidsley stated came with kernel upgrade to 3.9-7 but I had 3.10-rc6, so for me I can't link it to that.
Either way this seems to be the solution.
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cd /etc/modprobe.d/
sudo vi alsa-base.conf
find and comment out these three lines (you can see I've already commented them out)
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##install snd /sbin/modprobe --ignore-install snd && { /sbin/modprobe --quiet snd-ioctl32 ; /sbin/modprobe --quiet snd-seq ; : ; }
##install snd-rawmidi /sbin/modprobe --ignore-install snd-rawmidi && { /sbin/modprobe --quiet snd-seq-midi ; : ; }
##install snd-emu10k1 /sbin/modprobe --ignore-install snd-emu10k1 && { /sbin/modprobe --quiet snd-emu10k1-synth ; : ; }