Re: Is BT just taking or is it contributing?
Given there are quotes from Mark Shuttleworth, and it's "Ubuntu OpenStack" rather than just "OpenStack", I assume there are probably commercial arrangements of some sort in place between BT & Canonical. Which seems like it'd be both wise and a good thing for the underpinning open source projects.
Such arrangements might well be commercially sensitive so I wouldn't be surprised if there was a lack of detail.
(I have no knowledge of this deal, but I've had commercial support from Canonical in the past. It works well.)