User collections will allow Marketplace community members to create collections of apps for themselves, to share with friends and family and to share with the Marketplace community.
The design spec (still in progress) can be viewed here: http://mhanratty.github.io/marketplaceux-usercollections/spec
Source for the spec is spec.md
The user stories are tracked as issues
Please leave feedback in the individual user stories. Look forward to hearing from you ;)