Edit: so the old Dash icon was a free icon from http://www.yootheme.com/icons/freebies (the cat one). Recently this icon was replaced with a custom one, which makes sense, except the new Dash icon seems to be heavily "inspired" by somebody else's work -- http://dribbble.com/shots/913643-Chrome-replacement-icon
See the comparison here: http://twitpic.com/ciu8a7
Relevant tweets:
[Dash dev]
https://twitter.com/kapeli/status/328037766166368256
https://twitter.com/kapeli/status/328112260805451779
[Icon designer]
https://twitter.com/wakaba_en/status/328075341618892800
Seems like the Dash dev disagrees with the icon author on where the line between "inspiration" and "plagiarism" lies. It doesn't help that there's a language barrier between the icon author and Dash developer.
Icon designer even proposed an alternative icon:
http://dribbble.com/shots/1046492-Dash-app-replacement-icon
But sadly it seems like this issue hasn't been rectified, but has just been forgotten about. I only found out about this after I'd bought a license; I'm posting this here in case someone else finds it relevant to their purchasing decisions.