So far Docker seems to be a good citizen when it comes to FOSS, hopefully that will continue.
I've been following the Mirage and rumpkernel lists for a while and its nice to see these hackers getting traction (and money!) for their efforts.
Not too long ago unikernel.org was started, which IIRC was billed as a community driven "one stop shop" for information on the subject, which I assume is independent of the company "Unikernel Systems". Hopefully Docker won't go rogue and start attacking others that use the term "unikernel" by claiming that its trademarked or something like that.
Congratulations Amir et al!