Get this list from visualstudioonline.com (UserStories)
Show more bootrappy pages to see what you're changes will add up to
Ability to change color functions like 'darken' and 'lighten'
Ability to change variables of other types than colors
Ability to 'blacklist' variables
Ability to 'share' you're design with others
Ability to publish .css file to Azure CDN
Upload you're own .less files